• Details several methods to control exposure to high concentrations of dusts from sanding drywall joint compound. (cdc.gov)
  • Assessment of silica exposure and engineering control s during tuckpointing. (cdc.gov)
  • The Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (PEL) for respirable dust containing crystalline silica for the construction industry is measured in millions of particles per cubic foot (mppcf) and is calculated using the following formula: PEL=250 mppcf/% silica+5. (cdc.gov)
  • Well-designed engineering controls are typically passive, in the sense of being independent of worker interactions, which reduces the potential for worker behavior to impact exposure levels. (wikipedia.org)
  • Engineering control approaches are often oriented towards reducing inhalation exposure through ventilation and isolation of the toxic material. (wikipedia.org)
  • Put on appropriate personal protective equipment (see section exposure controls/personal protection). (europa.eu)
  • According to the Centers for Disease Control and Prevention, lead exposure occurs by 'touching, swallowing or breathing in lead or lead dust. (yahoo.com)
  • Use local exhaust to maintain concentration at a low exposure level. (espimetals.com)
  • Implement engineering and work practice controls to reduce and maintain concentration of exposure at low levels. (espimetals.com)
  • Avoid exposure - obtain special instructions before use.Provide appropriate exhaust ventilation at places where dust is formed. (lookchem.com)
  • The controls were 1306 workers with no history of occupational dust exposure. (bmj.com)
  • With the exception of (d), most of the prevalences increased with increasing age, duration of exposure, and cumulative inhalable dust exposure. (bmj.com)
  • Compared with controls, after adjustment for sex and smoking, with the exception of (d), all the pooled relative risks of respiratory abnormalities were raised for cotton exposure. (bmj.com)
  • In these operations, beryllium exposure may occur as a result of high dust levels generated despite the low beryllium content of the blasting materials or the surfaces. (osha.gov)
  • Beryllium sensitization (BeS) is the activation of the body's immune response to beryllium, which can result from inhalation or skin exposure to beryllium dust, fume, mist or solutions. (osha.gov)
  • Some of this dust may be fine enough to breathe deeply into the lungs and may be associated with negative health effects, especially for workers with repeated exposure over time to high levels of this type of dust. (3m.com)
  • How does Respirable Crystalline Silica Dust Exposure Occur? (3m.com)
  • These regulations require contractors to control their employees' exposure to respirable crystalline silica and also set out a new, reduced Permissible Exposure Limit (PEL). (3m.com)
  • The regulations also specify the need for employers to put together a written exposure control plan, parameters for medical surveillance , recordkeeping, housekeeping measures, and that a Silica Competent Person must be trained and certified to monitor activities on a job site to help reduce silica exposure, including providing training for employees. (3m.com)
  • Contractors are required to "fully and properly" implement these controls unless they use the prescribed alternative exposure assessment methods discussed in the next paragraph. (3m.com)
  • For tasks not listed in Table 1, or if the controls listed are not "fully and properly" implemented, contractors must conduct exposure assessments for each worker who may be exposed above the action limit and ensure they are not exposed to airborne concentrations above the PEL. (3m.com)
  • These tools should be considered as part of the available engineering controls and containment methods such as abrasive blast cleaning machines and cabinets, wet drilling, or wet sawing of silica-containing materials to help control the hazard and protect adjacent workers from exposure. (3m.com)
  • In this case special mining techniques such as dust suppression, and in extreme cases remote handling techniques, are employed to limit worker radiation exposure and to ensure the safety of the environment and general public. (world-nuclear.org)
  • exposure to HMs has been studied mainly by monitoring the concentrations in body fluids such as blood or urine, Heavy metals (HMs) are metals with specific densities or by studying their concentrations in ambient air. (who.int)
  • The study was novel in that researchers collected and analyzed house dust from the participants' homes as a measure of exposure to flame retardants - levels of the latter in house dust significantly correlate with personal exposure, Dr Sosa explained. (medscape.com)
  • Occupational exposure to nickel and hexavalent chromium and the risk of lung cancer in a pooled analysis of case-control studies (SYNERGY). (who.int)
  • Male Wistar rats were randomized into four groups: Control Group (CG), Exposure to Smoke Group (ESG), Antioxidant Group (AG) and Exposure to Smoke plus Antioxidant Group (ESAG). (bvsalud.org)
  • The WRF-DUST model generally performs reasonably well in reproducing the temporal variations and spatial distributions of near-surface [PMC] (mass concentration of particulate matter with aerodynamic diameter between 2.5 and 10 µ m) during the dust storm event. (copernicus.org)
  • Monitor weather conditions and particulate matter concentrations in and around the mine site in real-time. (teck.com)
  • By contrast, coal from the crushing station contains a higher fraction of fine particulate matter, so it typically calls for a ducted dust collector. (powermag.com)
  • After all, dust or particulate suspended in the air can be a nuisance, a quality issue, or most significantly a safety issue. (ritehite.com)
  • From a safety standpoint, there are many circumstances where a high enough concentration of airborne dust sized particulate in a closed space can become explosive or flammable. (ritehite.com)
  • This report documents exposures to crystalline silica and describes the effectiveness of a commercially available dust collection system designed for tuckpointing tools. (cdc.gov)
  • Controlling exposures to occupational hazards is considered the fundamental method of protecting workers. (wikipedia.org)
  • Methods earlier in the list are considered generally more effective in reducing the risk associated with a hazard, with process changes and engineering controls recommended as the primary means for reducing exposures, and personal protective equipment being the approach of last resort. (wikipedia.org)
  • Exposures occur when beryllium and beryllium-containing materials are processed in a way that releases airborne beryllium dust, fume, or mist into the workplace air. (osha.gov)
  • Activities such as abrasive blasting with silica sand, sawing brick or concrete, sanding or drilling into concrete walls, grinding mortar, manufacturing brick, concrete blocks, stone countertops , or ceramic products, and cutting or crushing stone can result in worker exposures to respirable crystalline silica dust. (3m.com)
  • Exposures above the PEL must be controlled first by engineering controls (e.g., wet cutting, HEPA filtered local exhaust ventilation, etc.) and work practice controls. (3m.com)
  • Despite significant progress made in reducing dust exposures in underground coal miners in the United States, severe cases of coal workers' pneumoconiosis (CWP), including progressive massive fibrosis (PMF), continue to occur among coal miners. (bmj.com)
  • Overview of Environmental and Occupational Lung Disease Environmental and occupational lung diseases result from inhalation of dusts, chemicals, gases, fumes, and other airborne exposures. (msdmanuals.com)
  • Parental occupational exposures in wood-related jobs and risk of testicular germ cell tumours in offspring in NORD-TEST a registry-based case-control study in Finland, Norway, and Sweden. (who.int)
  • An aerosol may be defined as a suspension of particles or droplets in the air and includes airborne dusts, mists, fumes or smoke. (cdc.gov)
  • An area where combustible dusts or ignitable fibers and flyings are present continuously or for long periods of time. (engineeringtoolbox.com)
  • An area where combustible dusts or ignitable fibers and flyings are likely to occur under normal operating conditions. (engineeringtoolbox.com)
  • An area where combustible dusts or ignitable fibers and flyings are not likely to occur under normal operating conditions and do so only for a short period of time. (engineeringtoolbox.com)
  • Explosions in underground mines and surface processing facilities are caused by accumulations of flammable gas and/or combustible dust mixed with air in the presence of an ignition source. (cdc.gov)
  • Develop an IoT ('Internet of Things') system using CompactRIO that can detect the workers and vehicles, measure the concentration of substances such as dust or combustible gases, and monitor and control various kinds of electrical equipment. (ni.com)
  • Coal workers' pneumoconiosis (CWP) is a slowly progressive parenchymal lung disease caused by the inhalation of coal mine dust. (bmj.com)
  • A high blood lead level in enter the human body via direct ingestion of soil via con- children with asthma has been identified as a risk factor taminated hands, inhalation of dust and eating polluted for increasing asthma severity, eosinophilia and elevated plants grown close to roads with heavy traffic or contam- immunoglobulin E levels ( 13 ). (who.int)
  • Engineering controls are physical changes to the workplace that isolate workers from hazards by containing them in an enclosure, or removing contaminated air from the workplace through ventilation and filtering. (wikipedia.org)
  • Ignitable concentrations of flammable gases or vapors which are present continuously or for long periods of time. (engineeringtoolbox.com)
  • Ignitable concentrations of flammable gases or vapors which are likely to occur under normal operating conditions. (engineeringtoolbox.com)
  • Ignitable concentrations of flammable gases or vapors which are not likely to occur under normal operating conditions and do so only for a short period of time. (engineeringtoolbox.com)
  • Personal protection: filter respirator for organic gases and vapours adapted to the airborne concentration of the substance. (lookchem.com)
  • Depending on particle size, composition, shape and concentration, particles can cause adverse health effects in workers. (cdc.gov)
  • Effective in removing 99% of dust particles*, nanoe-G releases negative ions to capture dust particles as small as PM2.5, carrying them back to the filter to provide a cleaner indoor environment. (panasonic.com)
  • Test result: Removed 99% of particles in 202 minutes (compared to the initial concentration). (panasonic.com)
  • After NIOSH research revealed that there are finer coal particles in intake airways, the Mine Safety and Health Administration (MSHA) revised the Title 30 Code of Federal Regulations 75.403 for maintenance of incombustible content of rock dust by increasing the incombustible requirement from 65% to 80% in intake airways. (cdc.gov)
  • Most obviously, fabric curtain walls act as a very effective physical barrier on their own, blocking the transfer of dust particles from space to space. (ritehite.com)
  • Larger or more coarse particles, including dust and pollen are more restricted to the thoracic cavity and unable to penetrate the smaller airway systems. (who.int)
  • The lead concentrations were first discovered after health officials in North Carolina investigated elevated blood lead levels in four children and found that they had all consumed WanaBana apple cinnamon pouches. (yahoo.com)
  • To describe spice samples-types, origin, lead concentrations, and the implication of findings for public health programs and global food safety regulations. (lww.com)
  • More than 50% of the spice samples had detectable lead, and more than 30% had lead concentrations greater than 2 ppm. (lww.com)
  • In short, the land-air-ocean interactions through aerosol deposition are a lot more complicated than the simple paradigm 'dust equals iron, equals phytoplankton growth'," she adds. (bioedonline.org)
  • In either case, grade control is usually achieved by measuring radioactivity as a surrogate for uranium concentration. (world-nuclear.org)
  • Avoid formation of dust and aerosols. (lookchem.com)
  • Copper concentrations in aerosols around the world vary, but are set to rise in areas downwind of fast-developing Asian countries, such as India and China. (bioedonline.org)
  • The decaying, partially leached snow pack near S6 in south-west Greenland produced meltwater with relatively constant nitrate (NO 3 − ) concentrations, approximating the snow pack average (1.1 µM). (frontiersin.org)
  • The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website. (cdc.gov)
  • Centers for Disease Control and Prevention. (cdc.gov)
  • However, in order to assess the impact of a particular pollution control strategy, it is important to predict pollutant concentration over the entire city in response to the control strategy. (researchgate.net)
  • A controlled amount of pollutant is pumped into the room, the fans mixing and homogenising the pollutant concentration. (dyson.com)
  • Critical temperatures and concentration parameters for substances like coal, zinc, uranium and more. (engineeringtoolbox.com)
  • An online " Webinar and Workshop on Preventing Coal Dust Explosions in Underground Coal Mines . (cdc.gov)
  • In the United States, following publicity on the plight of coal miners, Congress passed the Federal Coal Mine Health and Safety Act of 1969, 3 which placed strict controls on airborne respirable dust concentrations in underground coal mines. (bmj.com)
  • Engineering controls involve a physical change to the workplace itself, rather than relying on workers' behavior or requiring workers to wear protective clothing. (wikipedia.org)
  • The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace. (lookchem.com)
  • RESULTS--The median inhalable dust concentrations ranged from 0.41 to 1.51 mg/m3 and median total dust concentrations from 3.04 to 12.32 mg/m3. (bmj.com)
  • Those with dust BDE-209 concentrations above the median were 2.29 times as likely to have papillary thyroid cancer as compared with those with low BDE-209 concentrations. (medscape.com)
  • The prevalence of asthma and allergic sensitization was 4 and 6 times lower in the Amish population, with higher median endotoxin levels in house dust. (medscape.com)
  • The U.S. National Institute for Occupational Safety and Health researches engineering control technologies, and provides information on their details and effectiveness in the NIOSH Engineering Controls Database. (wikipedia.org)
  • The NIOSH Mining Program's ongoing intramural research addresses methane and coal dust explosion problems in the coal mining industries. (cdc.gov)
  • NIOSH Mining is also conducting research to advance the understanding of methane sources, migration and control strategies, interactions of sealed and active gobs with working sections, and improved ventilation methods through a complete understanding of longwall bleeder system effectiveness. (cdc.gov)
  • Recommendations for a New Rock Dusting Standard to Prevent Coal Dust Explosions in Intake Airways " and " NIOSH Hazard ID (16): Non-Conforming Rock Dust . (cdc.gov)
  • Based on results of an extensive coal dust particle size survey and large-scale explosion testing, NIOSH recommended a new standard of 80% total incombustible content be required in the intake airways of bituminous coal mines in the absence of methane. (cdc.gov)
  • Likewise, after NIOSH published its Hazard ID, rock dust manufacturers, suppliers, and mine operators each implemented, as necessary, quality control measures to ensure that the rock dust used in the mines for explosion suppression met the size specifications detailed in the rock dusting standard. (cdc.gov)
  • NIOSH - approved dust, mist, vapor respirator. (espimetals.com)
  • Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU). (lookchem.com)
  • We understand that at times, fugitive dust generated from our operations is visible. (teck.com)
  • Progressive reclamation helps to minimize fugitive dust generation and improve visual quality by establishing plants in areas of disturbance. (teck.com)
  • Collected fugitive dust is fuel that should be delivered to the furnace and burned (Figure 1). (powermag.com)
  • A new test method to examine dispersibility of a rock dust, "Design and Development of a Dust Dispersion Chamber to Quantify the Dispersibility of Rock Dust. (cdc.gov)
  • These projects have increased the vegetation coverage rate, however, previous studies did not quantify the effectiveness of these projects on dust concentrations. (chinadaily.com.cn)
  • Many of these recent explosions have been due to methane ignitions in abandoned workings that breached the mine seals and extended into the active areas or a deficiency in rock dust related to poor rock dusting practices. (cdc.gov)
  • Research strategies include eliminating ignition sources, minimizing methane concentrations and coal dust accumulations, applying proper dispersible rock dust in sufficient quantity at all locations, using supplemental protection such as passive and active barriers to suppress propagating explosions, understanding the science of explosions, properly designing and evaluating the strength of ventilation structures, and properly managing sealed areas. (cdc.gov)
  • Laboratory and/or mine-site research is conducted to identify and evaluate improved rock dusting practices and sampling methods and new technologies and structures to mitigate underground coal mine explosions. (cdc.gov)
  • The Envirosuite system is a critical dust management digital tool that informs our blasting practices and placement of water trucks, misters and dust suppressants. (teck.com)
  • Component failure in the electrical control circuits of mining machines account for a large percentage of the total downtime of the machine. (cdc.gov)
  • Mining Publication: Methane and Dust Control by Water Infusion: Pittsburgh Coalbed (Fairview, W. Va. (cdc.gov)
  • Where a deposit holds a significant concentration of two or more valuable minerals then the cost of recovering each individual mineral is reduced as certain mining and treatment requirements can be shared. (world-nuclear.org)
  • The farms had 707.1 EU/m 3 LPS in total dust, and 15.8 EU/m 3 LPS in respirable dust. (go.jp)
  • Total dust and inhalable dust were measured by Chinese total dust sampler and American vertical elutriator respectively. (bmj.com)
  • No increasing trends of respiratory abnormalities were found for current total dust, inhalable dust, and cumulative total dust concentrations. (bmj.com)
  • Highwalls and spoils have large surface areas that are difficult to reach with existing dust suppression tools (e.g., sprinklers, misters). (teck.com)
  • This year a field trial of an underbody dust suppression system on our drills is being conducted to determine whether this will reduce dust generated during drilling operations. (teck.com)
  • Well-designed engineering controls can be highly effective in protecting workers and will typically be independent of worker interactions to provide this high level of protection. (wikipedia.org)
  • Soilworks products are the industry's top standard due to our insistence on creating high performance soil stabilization and dust control products that stand up to rigorous testing - both in the lab and in the field. (soilworks.com)
  • The Food and Drug Administration is urging parents and caregivers to throw out WanaBana apple cinnamon fruit puree pouches and get their children tested in an urgent recall over "extremely high concentrations of lead. (yahoo.com)
  • According to the FDA, the North Carolina Department of Health and Human Services analyzed 'multiple lots' of the pouches and detected 'extremely high concentrations of lead. (yahoo.com)
  • Ultrasonic repellents are form of rodent control that uses high-frequency sound waves to eliminate pests and prevent rodent infestations. (globalspec.com)
  • The shallow meteoric ice (∼10 cm-1 m) beneath the snow pack had high concentrations of DON and NH 4 + (6.5 and 2.6 µM, respectively), while NO 3 − concentrations were similar to the snow pack (1.1 µM). (frontiersin.org)
  • In a prenatally randomised, controlled study 120 infants with family history of atopy and high (greater than 0.5 kU/l) cord-blood concentrations of total IgE were allocated randomly to prophylactic and control groups. (nih.gov)
  • Nevertheless, special attention should be paid to reducing high levels of heavy metals in classroom dust in this area. (who.int)
  • high-incidence corridor stretching from and 1200 controls. (who.int)
  • Engineering controls are strategies designed to protect workers from hazardous conditions by placing a barrier between the worker and the hazard or by removing a hazardous substance through air ventilation. (wikipedia.org)
  • This position will be exposed to noise, dust, hazardous chemicals and green coffee dust. (swisswater.com)
  • A Zone defines the general nature - if it is a gas or dust - and the probability of hazardous material being present in an ignitable concentration in the surrounding atmosphere. (engineeringtoolbox.com)
  • Space fumigation, space treatment, crop dusting, and the direct application of chemicals to plants are still common methods. (globalspec.com)
  • The fine dust can include respirable crystalline silica (RCS), which is often too fine to see with normal lighting. (3m.com)
  • Workers in some areas were potentially exposed to silica (14808-60-7) in phosphate rock dust. (fluoridealert.org)
  • It is conducted with dust, pollen and tobacco smoke, and runs for 20 minutes each time. (dyson.com)
  • Dust control modifications were implemented on small, truck-mounted rock drills at surface coal mines. (cdc.gov)
  • The control techniques showed noticeable improvement in measured dust concentrations around the drills. (cdc.gov)
  • Describes effective methods for the control of mineral dusts in mines. (cdc.gov)
  • We take extensive measures to monitor and manage dust at our operations and are working to identify new methods to improve dust management and air quality. (teck.com)
  • A combination of field studies and numerical modeling methods are being used to identify gas migration pathways into working areas, sealed and active gobs, and to mitigate gas emissions using effective engineering controls. (cdc.gov)
  • Recent research focused on identifying possible strategies to reduce respirable rock dust contributions and to develop test methods by which companies can certify their rock dust. (cdc.gov)
  • This completely new Third Edition of the Mark Encyclopedia of Polymer Science and Technology brings the state-of-the-art to the twenty-first century, with coverage of nanotechnology, new imaging and analytical techniques, new methods of controlled polymer architecture, biomimetics, and more. (lu.se)
  • These ecological restoration projects reduced the sources of sand, with dust pollution down by 5 percent to 15 percent in the North China Plain, according to the study. (chinadaily.com.cn)
  • The Executive Board, in its consideration of health and the environment at its 135th session, decided to include the subject on the provisional agenda of the current session.1 This report describes the links between air pollution and health, and outlines some strategies for prevention, control and mitigation of the adverse effects of air pollution on health, including coordinated action between the health and other sectors. (who.int)
  • Blood taken from the farmers and controls was subjected to plasma IgE and IgG subclass measurements. (go.jp)
  • Elevated concentrations of immunoglobulin G subclass 1 (IgG1) and immunoglobulin G subclass 4 (IgG4) anti-IgE autoantibodies have been found in patients with nonallergic rhinitis compared with control subjects. (medscape.com)
  • In 1975, Huggins and Brostoff described a subset of patients with a history suggestive of dust mite allergy but negative skin prick testing who were found to have positive reactions to nasal provocation testing and specific IgE antibodies to dust mites in their nasal secretions. (medscape.com)
  • Malvern Insitec systems deliver the online continuous particle size analysis needed for efficient, cost-effective monitoring and control of industrial processes. (dksh.com)
  • Under these regulations, there is also a table of activities (Table 1) that specifies 18 different tools/tasks along with specified engineering and work practice controls, as well as respirator selection information. (3m.com)
  • In August 2022, we received approval to test four custom blend foaming products as dust suppressants. (teck.com)
  • A new project will be completed at the Elkview Operations processing plant in Fall 2022 to reduce the dust concentration in the dryer exhaust stacks by installing spray nozzles upstream of the dryer scrubber. (teck.com)
  • At 12 months, allergic disorders had developed in 25 (40%) control infants and in 8 (13%) of the prophylactic group (odds ratio 6.34, 95% confidence intervals 2.0-20.1). (nih.gov)
  • In addition, concentrations of serum-soluble Fas (inherent signals for cell death) are substantially elevated in patients with allergic rhinitis compared with patients with nonallergic rhinitis. (medscape.com)
  • In fact, as Bennett Harrison of New York's New School (and a longtime TR columnist) pointed out in his book Lean and Mean in 1997, unskilled workers "barely off the farm" can readily be trained to operate computer-controlled presses and similarly sophisticated production machinery. (technologyreview.com)
  • The self cleaning cartridge downdraft table helps eliminate dust, smoke and other airborne pollutants before reaching the workers breathing zone. (airex-industries.com)
  • OBJECTIVES--To study the prevalence of byssinosis and other respiratory abnormalities in workers exposed to cotton dust in Guangzhou in two factories that processed purely cotton. (bmj.com)
  • Use the data collected to confirm that the safety of workers can be assured, and then reduce the amount of unnecessary energy consumption by automatically controlling the lighting and ventilating fan. (ni.com)
  • To assess the effect of ERPs on dust concentrations, a regional transport/dust model (WRF-DUST, Weather Research and Forecast model with dust) is applied to investigate the evolution of dust plumes during a strong dust storm episode from 2 to 8 March 2016. (copernicus.org)
  • We selected 32 schools for collecting classroom dust samples during September-November 2016. (who.int)
  • In all homes, researchers will periodically survey the residents, monitor cockroach numbers, and monitor allergen levels in dust samples. (nih.gov)
  • The most important predictors for detectable levels of house-dust mite allergen Der p 1 were Arabic-style houses (OR 3.21) and newer houses (OR 1.56). (who.int)
  • In homes without cats, rubber mattresses were associated with detectable cat allergen Fel d 1 in mattress dust (OR 1.6). (who.int)
  • Elimination and substitution are usually considered to be separate levels of hazard controls, but in some schemes they are categorized as types of engineering control. (wikipedia.org)
  • Indoor total and respirable dust levels and their endotoxin (LPS) and aflatoxin (AF) levels in the farms were measured. (go.jp)
  • The Zone system has three levels of hazard for gas or dust. (engineeringtoolbox.com)
  • The cytokines released by PBMC from farmers indicated skewing toward Type-2 helper T-cell responses: interferon (IFN)-γ:interleukin (IL)-4 and IFNγ:IL-13 ratios were significantly lower than for control PBMC. (go.jp)
  • The prevalences at 12 months of asthma (4.13, 1.1-15.5) and eczema (3.6, 1.0-12.5) were also significantly greater in the control group. (nih.gov)
  • The other benefit of using industrial curtain walls for a dust control application is that they can significantly improve the effectiveness of an exhaust system as well as offer the opportunity for cost savings, both in the initial cost of the equipment, as well as in direct operating cost. (ritehite.com)
  • Explosive dust atmosphere. (engineeringtoolbox.com)
  • The type of product being processed will also determine if an NFPA compliant dust collector is required so that safety is ensured when packaging potential explosive dust. (aafintl.com)
  • The con- centration of 10 heavy metals was measured in these dust samples by optical emission spectrometry. (who.int)
  • The concentration of heavy metals in classroom dust samples ranged from 7559 to 53 723.0 mg/kg (mean: 16 945.5 mg/kg) for Fe, 169.0 to 952.0 mg/kg (mean 288.9 mg/kg) for Mn, and 9.0 to 971.0 mg/kg (mean 258.8 mg/kg) for Pb. (who.int)
  • We found no correlation between heavy metals in classroom dust and childhood asthma. (who.int)
  • Engineering controls is the third of five members of the hierarchy of hazard controls, which orders control strategies by their feasibility and effectiveness. (wikipedia.org)
  • however, the presence of large quantities of rock dust obscured the results on the following days. (cdc.gov)
  • Dust collection systems capture fugitive coal dust that would otherwise escape from the perimeter of equipment areas. (powermag.com)
  • In these cases, the result is a layer of coal dust that accumulates on all horizontal surfaces. (powermag.com)
  • The density of coal dust can be half that of coal, so irregular dumping might be symptomatic of rotary airlock sizing, bridging, or aeration problems. (powermag.com)
  • However, not all of the variation in Participants environment.Thedatacollectedinclud- house-dust mite concentrations can ed:householdsize,presenceofcigarette beexplainedbyhousingcharacteristics Toestimatethesamplesize,wemade smokers,presenceofpets,typeofhouse alone[6]. (who.int)
  • Elkview Operations continues to evaluate mine design to reduce dust. (teck.com)
  • In recent decades, the Chinese government has made a great effort in initiating large-scale ecological restoration programs (ERPs) to reduce the dust concentrations in China, especially for dust storm episodes. (copernicus.org)
  • BEIJING -- China's ecological restoration projects are beneficial in controlling dust erosion and reducing dust concentration in the North China Plain, especially during spring, according to a recently published study. (chinadaily.com.cn)
  • Scientists from the Institute of Earth Environment under the Chinese Academy of Sciences used satellite remote sensing observations, ground observations, and model simulations to conduct quantitative assessment of the effect of China's ecological restoration projects on dust control in the North China Plain. (chinadaily.com.cn)
  • Space fumigation subjects a sealed or covered area to deadly concentrations of a poisonous gas over several days time. (globalspec.com)
  • Uranium is a naturally occurring element with an average concentration of 2.8 parts per million in the Earth's crust. (world-nuclear.org)
  • Vast amounts of uranium also occur in the world's oceans, but in very low concentrations. (world-nuclear.org)
  • In these cases the concentration of uranium may be as low as a tenth of that in orebodies mined primarily for their uranium content. (world-nuclear.org)
  • In this case, lower concentrations of uranium than usual can be recovered at a competitive cost. (world-nuclear.org)
  • The developed SRM has been used to estimate the contribution of vehicles and brick kilns to ambient PM concentrations, using a grid-based emission inventory that considers temporal variations in emissions. (researchgate.net)
  • The developed SRM could be easily utilized to predict ambient PM concentrations as new sources are added/ removed from the domain. (researchgate.net)
  • Results of a few case studies have been reported in the paper to show the impact of emission redistribution on ambient concentration. (researchgate.net)
  • Coral barium to calcium (Ba/Ca) ratios have been used to reconstruct records of upwelling, river and groundwater discharge, and sediment and dust input to the coastal ocean. (usgs.gov)
  • Traditionally, a hierarchy of controls has been used as a means of determining how to implement feasible and effective controls, which typically include elimination, substitution, engineering controls, administrative controls, and personal protective equipment. (wikipedia.org)
  • Pest control products and equipment for birds include noise cannons, pyrotechnics, sight and motion devices, lasers, recorded distress calls, chemical repellents, and integrated bird control systems for airports and airfields. (globalspec.com)
  • Pest control products and equipment for rodents include mouse traps, rat traps, kill and seal traps, ultrasonic repellents, and rodenticides. (globalspec.com)
  • Optimize placement and application of dust control measures based on early warning dust concentrations or weather (e.g., wind speed and direction) triggers. (teck.com)
  • Equipment operating procedures also can cause dusting problems that necessitate excessive maintenance. (powermag.com)
  • Quality of life studies have demonstrated that the burden of rhinitis is not simply sinonasal but may be associated with impaired sleep, excessive daytime sleepiness, concentration problems, and increased irritability. (medscape.com)
  • Both the grass GGW and forest GGW are located between the dust source region (DSR) and the densely populated North China Plain (NCP). (copernicus.org)
  • Handle in an inert gas in a controlled atmosphere. (espimetals.com)
  • Handle and store in a controlled atmosphere and under an inert gas such as argon. (espimetals.com)
  • It is a climate-controlled chamber, with solid walls, floor and ceiling. (dyson.com)
  • For example, a plant's railcar-unloading system will usually have a ducted dust collection system, a passive enclosure chamber, or some form of control spray. (powermag.com)
  • Due to its vertical cartridge design, the DDT series of cartridges downdraft table, unlike most of its competitors, does not require any semi circle baffles to prevent the unnecessary accumulation of dust on any particular side of the cartridges. (airex-industries.com)