Measurements of aerosol. Medical search. Frequent questions

In this lab session we will focus on submicron aerosol from two perspectives: measuring ultrafine particles in the atmosphere, and generating submicron calibration aerosol in the laboratory. (tsi.com)
The PILS is a well-established aerosol collection device that provides a liquid sample containing dissolved aerosol particles which can be analyzed by various methods. (noaa.gov)
Heterogeneous Atmospheric Dust: Individual Particles Microanalysis Optical Property Modeling and Lab-Generated Particle Analogs - ( J. Conny , MML) Goal: to determine the natural variation in optical properties of heterogeneous aerosols based on microanalysis of selected individual particles. (nist.gov)
We present a new method for estimating the size, shape and optical constants of atmospheric particles from light-scattering measurements made both in the laboratory and aboard an aircraft. (copernicus.org)
With over 40 years of experience, the company offers innovative solutions for the detection and analysis of aerosol particles in various fields such as environmental monitoring, occupational safety and research. (durag.com)
This instrument is especially useful because it allows me to distinguish between the dust particles, generally bigger than 0.5 μm, and the combustion aerosols that are generally smaller. (mtu.edu)
How to detect, collect and analyse aerosol particles. (chalmers.se)
As the name suggests, TSP are all aerosol particles (sometimes even above 100 m m sizes) suspended in the air. (chalmers.se)
The APS is used for measurement of size distributions of particles in the size range 0.5 20 m m aerodynamic diameter. (chalmers.se)
ISO 29904:2013 provides a guide to the generation of aerosol particles in fires, defines apparatus and procedures for the sampling and measurement of aerosols, and provides procedures for the interpretation and reporting of the data. (iso.org)
Aerosol particles may be inhaled to various depths in the lungs, depending on their size and density, or may be released into the environment and deposited on land and in watercourses. (iso.org)
The chemical composition of nonrefractory submicron aerosol particles was measured at the Puy-de-Dôme (PUY) station (1,465 m a.s.l) during 2015 using a Time-of-Flight Aerosol Chemical Speciation Monitor (ToF-ACSM). (lib4ri.ch)
Since March 2006, continuous measurements of aerosol particles (optical and physical properties), ozone (O3) and meteorological parameters as well as weekly samplings of particulate matter (for chemical analyses) and grab air samples for the determination of 27 halocarbons, have been carried out. (dlr.de)
at 532 nm associated with these non-spherical sea salt particles and found that the aerosol optical depth (AOD) contributed by these particles remained small (0.03-0.04) but represented on average about 30%-40% of the total column AOD. (nasa.gov)
An aerodynamic aerosol classifier (AAC) is an embodiment of a measurement technique for classifying aerosol particles according to their aerodynamic diameters. (wikipedia.org)
The comparison of the in vivo and manikin measurements suggests the natural convective air current, resulting from the human body heat, might interact with the settling of airborne particles in calm air and cause a slightly higher inhalability for particles smaller than 50 μ m. (johnshopkins.edu)
After integrating all the three units, the total number concentration and the geometric mean diameter of test aerosol particles were determined and the results were compared with those obtained using commercial instruments. (elsevierpure.com)
Lahore is an inland city, consisting of built-up areas and agricultural land and dominated by mainly fine aerosol particles. (edu.hk)
Karachi is an urban-coastal city with built-up areas and bare land, and mainly affected by coarse aerosol particles. (edu.hk)
Baron, P.: "Generation and Behavior of Airborne Particles (Aerosols). (cdc.gov)
Aerosols are small respiratory particles that can linger in the air and can disperse or travel over a distance of 2 meters under certain circumstances. (cdc.gov)
The test aerosol should include particles at or near the most penetrating particle size range. (cdc.gov)
The test aerosol should be charge neutralized (have an equal distribution of positively and negatively charged particles), because charge neutralization has been shown to lower the filter collection of particles. (cdc.gov)
Substances like biogenic volatile organic compounds (BVOC), the various nitrogen oxides, carbonaceous particles, ozone or methane act in the atmosphere either directly as greenhouse gases and aerosols, or as key precursors for greenhouse gases and secondary organic aerosol. (lu.se)
Compared to analogue works where the particles sit on a substrate, the aerosol phase is ideal to study surface segregation of "free" nanostructures. (lu.se)
He was introduced to aerosol particles during his master thesis, where he worked with polymeric nanofiber production to improve air-filters. (lu.se)
This thesis focuses on how volcanic aerosol particles influence the climate by scattering solar radiation and altering cloud properties. (lu.se)

Large contribution of organic aerosols as compared to previous studies. (aaqr.org)
A newly modified fast temperature-stepping thermodenuder (TD) was coupled to a High Resolution Time-of-Flight Aerosol Mass Spectrometer for rapid determination of chemically resolved volatility of organic aerosols (OA) emitted from individual sources. (nasa.gov)
The NIST Greenhouse Gas Measurements Program supports researchers and collaborators as they work to advance our understanding of carbonaceous aerosols, including the direct and indirect radiative forcing effects of black carbon and organic aerosol particulates. (nist.gov)
Secondary Organic Aerosols - (S. McGivern, MML) Goal: to identify and characterize chemical processes that affect the interaction of atmospheric organic aerosols with incoming solar radiation. (nist.gov)
Averaged over the entire year, and normalized to standard temperature and pressure, organic aerosol (OA) dominates the PM1 concentration during all seasons and within all air mass types (2.12 ± 1.73 µgm -3 ), and is responsible for summertime increases in aerosol concentration. (lib4ri.ch)
A predictive model for secondary organic aerosol (SOA) formation including both partitioning and heterogeneous reactions is explored for the SOA produced from the oxidation of toluene in the presence of inorganic seed aerosols. (cdc.gov)
Condensational growth of aerosol nanoparticles by photolysis of metal-organic precursors is a new route that can be carried out at room temperature. (lu.se)

Common sense suggests that viruses or bacteria are collected differently from engineered nanoparticles, silica dusts, oil mists or other types of workplace aerosols. (cdc.gov)
This ensures that filters in NIOSH certified respirators will collect all types of workplace aerosols - including emerging hazards such as airborne infectious organisms ( 15 ) and engineered nanoparticles ( 7 ) - with very high efficiency. (cdc.gov)
When properly selected and used, respirators tested using these types of filter tests should provide expected levels of protection against all types of workplace aerosols. (cdc.gov)

Balloon-borne measurements of the stratospheric sulfate aerosol from late 1971 to mid-1974, a quiescent period in terms of large volcanic eruptions at stations ranging from 85°N to 90°S, are utilized in a study of the global spatial and temporal variations and for sulfur budget and aerosol source considerations. (ametsoc.org)
The results of over 70 balloon soundings, by the University of Wyoming's Atmospheric Physics Group mostly during 1972 and 1973 from a number of stations, are being utilized in a study of the temporal and spatial distribution of the global stratospheric aerosol. (ametsoc.org)
This period comprises an interval apparently free of major volcanic activity just prior to the extensive volcanic contributions to the stratospheric aerosol which occurred in late 1974. (ametsoc.org)
A simple seasonal variation in the total stratospheric aerosol loading below about 20 km altitude dominates the temporal variation at Laramie, resulting in a maximum in winter and a minimum in summer. (ametsoc.org)
The ATAL was confirmed through solar occultation observations by Stratospheric Aerosol and Gas Experiment (SAGE) II after improving the cloud-aerosol separation approach using the ratio between aerosol extinction coefficients retrieved at two wavelengths. (edu.sa)

Participants will gain a deeper understanding of the fundamentals of aerosol properties and behavior, and will also receive practical skill training to sample, measure, and characterize airborne particulate matter in various applications. (tsi.com)
Thin grey layers above the clouds are often visible and are an indication of the presence of some kind of particulate, like aerosol from anthropogenic emission or biomass burning, dust, etc… However on this specific day we noticed a particularity: the layer above the clouds was composed of three well-defined sub layers (Figure 3). (mtu.edu)
Airborne NASA Langley Research Center (LaRC) High Spectral Resolution Lidar-2 (HSRL-2) measurements acquired during the recent NASA Earth Venture Suborbital-3 (EVS-3) Aerosol Cloud Meteorology Interactions over the Western Atlantic Experiment (ACTIVATE) revealed elevated particulate linear depolarization associated with aerosols within the marine boundary layer. (nasa.gov)
When assessing particulate emissions, diesel engine exhausts are usually diluted to suit the design limitations of the measurement devices. (sae.org)
Hofacre, K.C., A.W. Richardson, J.P. Eshbaugh, and P.D. Gardner: "Respirator filter efficiency testing against particulate and biological aerosols under moderate to high flow rates. (cdc.gov)

Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) spaceborne lidar aerosol measurements during several cold air outbreaks and CALIOP retrievals of column aerosol lidar ratio using column AOD constraints suggest that CALIOP operational aerosol algorithms can misclassify these aerosols as dusty marine rather than marine aerosols. (nasa.gov)

Using vertical observation data of black carbon aerosol and meteorological parameters in the ShouXian area of Anhui Province from 14 December 2016 to 3 January 2017, the thermal and dynamic effects of the boundary layer on the vertical distribution structure of black carbon were studied. (frontiersin.org)

Journal of Aerosol Science , 37 (8), 967-973. (johnshopkins.edu)
Journal of Aerosol Science 20(8):1373-1376. (cdc.gov)

SPEXone is a concept satellite instrument that will measure the characteristics of aerosols in the earth's atmosphere with unparalleled accuracy for the purpose of climate and air quality research. (sron.nl)
Chamber-generated SOA under the relatively high concentrations used in traditional experiments was significantly more volatile than urban SOA, challenging extrapolation of traditional laboratory volatility measurements to the atmosphere. (nasa.gov)
The environmental sources of microbial aerosols and processes by which they are emitted into the atmosphere are not well characterized. (nature.com)
From these data, we estimate each fire aerosolized an average of 7 ± 4 × 10 9 cells and 2 ± 1 × 10 8 biological INPs per m 2 burned and conclude that emissions from wildland fire are sources of viable microbial aerosols to the atmosphere. (nature.com)
For this reason, it is important to characterize the vertical structure of the atmosphere and to understand within which conditions measurements done at the observatory can be considered to be independent from local emissions. (mtu.edu)
The measurements were made during two cruises as part of the Sea Spray, Gas Flux, and Whitecaps (SEASAW) project, a UK contribution to the international Surface Ocean Lower Atmosphere Study (SOLAS) program. (copernicus.org)

Development of an instrument for measuring light-absorbing carbonaceous aerosols in. (aerosol.si)
Aerosol d.o.o., based in Ljubljana, Slovenia, develops and manufactures scientific instrumentation for monitoring carbonaceous aerosols in the air. (aerosol.si)
More recently, we also started manufacturing instrumentation for monitoring other types of carbonaceous aerosols. (aerosol.si)
It collaborates with many leading world scientists from the field of carbonaceous aerosols. (aerosol.si)
Our instruments are used by scientific institutions, environmental monitoring agencies, industrial controllers, and many other applications to measure carbonaceous aerosols. (aerosol.si)
For more than 13 years we develop and manufacture the most relied upon instruments for monitoring carbonaceous aerosols. (aerosol.si)

2) When thermal effects were dominant, the concentration of black carbon aerosol was significantly affected by diurnal changes in the boundary layer. (frontiersin.org)
and during the transition from a stable to an unstable boundary layer, the black carbon aerosol concentrations exhibited high values in the upper layer, with the concentration difference reaching 4 μg m −3 . (frontiersin.org)
3) When the dynamic effect was dominant, the structure of the vertical distribution of black carbon aerosol was affected by wind and by diurnal changes in the boundary layer simultaneously. (frontiersin.org)
4 m/s) removed the black carbon aerosol. (frontiersin.org)
when stable boundary layers occurred and during transitions from stable to unstable boundary layers, the black carbon aerosol concentrations were higher in the lower layer and lower in the upper layer. (frontiersin.org)

abstract = "A series of NASA-ISRO-sponsored balloon campaigns in India and Saudi Arabia, called the Asian tropopause aerosol layer (ATAL) was conducted between 2014 and 2017 to study the nature, formation, and transport of polluted aerosols in the upper troposphere and lower stratosphere during the Asian summer monsoon (ASM). (edu.sa)

These aerosol chemistry measurements are combined with online black carbon (BC) measurements to provide an overview of the submicron aerosol composition. (lib4ri.ch)

This program aims to advance measurement capabilities for black carbon optical properties, improve methods for referencing material development and dissemination, and explore new instrumentation and characterization techniques. (nist.gov)

Thermally induced surface segregation in CuAg agglomerates forming Janus and core-shell nanoparticles have been studied on- and off-line with aerosol metrology and electron microscopy. (lu.se)

Shipboard sunphotometer measurements of aerosol optical depth spectra and. (nasa.gov)
It utilizes a synergy of ceilometer and sunphotometer measurements to retrieve aerosol particle size distribution, the spectral index of refraction, absorption and the degree of sphericity as well as a profile of aerosol extinction. (edu.pl)

The first study on both aerosol chemistry and CCN activity downwind Northeast Asia. (aaqr.org)
Aerosol chemistry and hygroscopicity varied with trajectory pathway. (aaqr.org)
Focuses in MERGE on aerosol and in the context relevant atmospheric chemistry modelling (tropospheric ozone), using the EMEP model as a stepping stone to introducing new parameterizations in regional and over time global climate models. (lu.se)

Low-cost sensors for aerosol optical thickness, ozone, temperature, relative humidity, and pressure were combined with a low-cost computer (Raspberry Pi) for automated monitoring. (aaqr.org)
60%) relative humidity, coincident airborne in situ size and composition measurements, and aerosol transport simulations. (nasa.gov)
McCullough, N., L. Brosseau, and D. Vesley: Collection of three bacterial aerosols by respirator and surgical mask filters under varying conditions of flow and relative humidity. (cdc.gov)

in the SOA model, the predictive SOA mass is decoupled into partitioning (OMP) and heterogeneous aerosol production (OMH). (cdc.gov)
Combining on-line compositional monitoring with the unique, precursor-less pathways to create heterogeneous nanoparticles that aerosol technology enables, this thesis is a step toward more sustainable synthesis of tailored bimetallic nanostructures with applications in, for instance, catalysis, sensors, and electronics. (lu.se)

The resulting retrieval produces particle size distributions (PSDs) that agree, within experimental error, with measurements made by commercial optical particle counters (OPCs). (copernicus.org)
The analysis of observational data is a direct means of understanding the spatial and temporal distributions of BC aerosol. (frontiersin.org)
Spatio-temporal distributions showed that the DT and DB C006 were well correlated with Karachi and Lahore AERONET measurements, respectively. (edu.hk)

The aim of this study was to evaluate the performance of the Aqua-MODIS (MYD04) collections 5.1 (C051) and 6 (C006) operational aerosol products over Pakistan. (edu.hk)

In this lab session, we will make measurements of the size distribution and particle number concentration of aerosols that exhibit highly transient behavior such as those emitted by internal combustion engines. (tsi.com)
In this study, we have compared measured concentration data with the predictions of the road network dispersion model CAR-FMI used in combination with an aerosol process model MONO32. (copernicus.org)
Production fluxes per unit area of whitecap are estimated from the mean aerosol concentration for each buoy deployment. (copernicus.org)
This particle number (PN) sensor was designed and fabricated for real-time measurement of total aerosol number concentration and geometric mean diameter. (elsevierpure.com)
The number concentration and geometric mean diameter of indoor aerosols were measured by PN 1 sensor and compared with SMPS data. (elsevierpure.com)
The number concentration was also compared with the results of CPC and Pegasor AQ Indoor (Pegasor, Finland) measurements. (elsevierpure.com)
Bryophytes (mosses) have long been used to determine the concentration of heavy metals as an alternative to the collection of atmospheric aerosols. (bvsalud.org)

The Generalized Retrieval of Aerosol and Surface Properties (GRASP) is applied to airborne and laboratory measurements made by a novel polar nephelometer. (copernicus.org)
The airborne measurements used in this work were made aboard the NASA DC-8 aircraft during the Studies of Emissions and Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys (SEAC 4 RS) field campaign, and the inversion of this data represents the first aerosol retrievals of airborne polar nephelometer data. (copernicus.org)
Ground based and airborne in-situ aerosol measurements during the APPRAISE-CLOUDS (Aerosol cloud interactions and climate) project from the Chilbolton Atmospheric Observatory, Hampshire (South West England) and on board the FAAM BAE-146 research aircraft. (ceda.ac.uk)
Airborne measurements for the APPRAISE-CLOUDS project were also carried out using the FAAM BAe146 aircraft. (ceda.ac.uk)
Airborne HSRL-2 measurements of elevated aerosol depolarization associated with. (nasa.gov)

Fire-generated aerosols may present a direct risk of restricting escape from fire by obscuring an exit route, or they may produce chronic health and environmental hazards from chemical compounds contained in the aerosol (for example, toxic chemicals like polycyclic aromatic hydrocarbons in soot or radionuclides form nuclear plant fires. (iso.org)
Physical mechanisms involved in the transport of aerosols, dispersal in the fire plume, coagulation/agglomeration leading to variation in particle sizes and fractions, "thermophoresis" (main cause of soot deposition), "diffusiophoresis" and, sedimentation. (iso.org)

Contributes with advanced climate-relevant aerosol measurements at various field sites as well as in laboratories, and process modelling in order to develop an validate parameterizations linking the carbon cycle to aerosol - cloud - climate interactions. (lu.se)

In situ measurements, including radiosonde observations, are key for the study of climate. (copernicus.org)
These include the Dark Target (DT) and the Deep Blue (DB) C051/C006 aerosol optical depth (AOD) observations at 10-km spatial resolution, and which were validated using 7 years (2007-2013) AOD measurements from two AERONET stations located in Pakistan's two largest cities, Lahore and Karachi. (edu.hk)

RHARM also estimates the measurement uncertainties. (copernicus.org)
This paper illustrates a method to determine the experimental uncertainties in the measurement of tailpipe emissions of carbon dioxide, carbon monoxide, nitrogen oxides, hydrocarbons, and particulates. (sae.org)

Such misclassification leads to ∼40-50% overestimates in the assumed lidar ratio and in subsequent retrievals of aerosol optical depth and aerosol extinction. (nasa.gov)

To understand the condensation inside a custom thermal evaporator designed in this work, a novel approach to measure the residence time distribution of aerosol nanoparticles is presented. (lu.se)

The mass concentrations and chemical compositions of the aerosols varied with trajectory pathway, which caused large fluctuations in κ values especially at higher SS conditions. (aaqr.org)

Above 20 km, no seasonal variation is evident, and the natural aerosol production processes appear to be nearly in equilibrium with loss processes. (ametsoc.org)
The data were collected for use in the CLOUDS project, which is one of multiple projects within the APPRAISE (Aerosol Properties, PRocesses And Influences on the Earth's climate) programme. (ceda.ac.uk)
Supports model development by laboratory-based experimental studies, aiming at improved model descriptions of key aerosol and cloud processes, such as SOA formation via BVOC oxidation, and SOA aging and associated changes in chemical and physical properties. (lu.se)

A method for the retrieval of aerosol optical and microphysical properties from in situ light-scattering measurements is presented and the results are compared with existing measurement techniques. (copernicus.org)

Aerosols, and their interaction with clouds, play a key role in the climate of our planet but many of their properties are poorly understood. (copernicus.org)
Figure 3: A photo of the aerosol layers above the clouds. (mtu.edu)
Missions typically involved flight legs above and below cloud to characterise aerosol in the vicinity of the clouds, and flight legs within cloud to characterise cloud properties and attempt to measure cloud particle residuals. (ceda.ac.uk)

The PUY site, situated at 1,465 m a.s.l, although mainly sampling in the atmospheric boundary layer, it is sometimes sampling in the lower free troposphere (FT), providing the opportunity to identify the characteristics of FT aerosol. (lib4ri.ch)
leading to an in-depth understanding of the spatial and temporal distribution characteristics, source resolution and formation mechanisms of BC aerosol. (frontiersin.org)
showed that the absorptive heating of BC aerosols by shortwave radiation depends on their vertical distribution characteristics. (frontiersin.org)
Therefore, these results recommend the use of the DT C006 algorithm over Karachi and the DB C006 over Lahore for qualitative regional air quality applications due to differences in land cover characteristics and aerosol types. (edu.hk)
Emission factors from different fuels and cooking methods, and particle characteristics will be assessed in our Aerosol Lab in Lund. (lu.se)

Analysis of long-term satellite measurements of upper troposphere and lower stratosphere (UTLS) aero-sols suggested that ATAL's aerosol optical depth had increased by 2-3 times since the late 1990s, pointing out its possible connection with Asian pollution growth. (edu.sa)

These layers are caused by seasonal changes in the source, transport, and deposition of aerosols. (lu.se)

The dashed green line represents the 0.3 um mass median aerodynamic diameter (MMAD) sodium chloride aerosol used by NIOSH for respirator filter testing of N95-class air purifying respirators. (cdc.gov)

According to the latest report (2013) by the Intergovernmental Panel on Climate Change (IPCC), aerosols represent the biggest uncertainty in the understanding of radiative forcing caused by human activity (cooling versus warming). (sron.nl)
As a result of this, the viewing angle is reduced to 100 km, without any further concessions being made to the instrument's performance, making SPEXone a research instrument for groundbreaking aerosol climate research and a demonstration for groundbreaking aerosol air quality research. (sron.nl)
SPEXone is an instrument that will provide experimental data aimed mainly at acquiring new knowledge about the fundamental aspects of aerosols and the effect these have on climate and health, without the intention of realizing a direct commercial application or a direct commercial use. (sron.nl)
After an accurate instrumental set-up at ISAC-CNR in Bologna (Italy) in autumn 2005, the ABCPyramid Observatory for aerosol (physical, chemical and optical properties) and trace gas measurements (ozone and climate altering halocarbons) was installed in the high Khumbu valley in February 2006. (dlr.de)
INES contributes to vegetation/ecosystem/land use modelling (LPJ-GUESS) and coupling with climate models, as well as efforts on aerosols with biospheric sources. (lu.se)

ISO 29904:2013 is not oriented toward the aerosols generated from controlled combustion. (iso.org)
Light absorbing components of aerosols, often called black carbon (BC), are emitted from combustion sources and are believed to play a considerable role in direct atmospheric radiative forcing by a nu. (sae.org)

An SOA model for toluene oxidation in the presence of inorganic aerosols. (cdc.gov)

These measurements will provide high chemical specificity of sulfur species to complement other aerosol composition measurements to be deployed, such as aerosol mass spectrometry, and will be used to address the following research questions: (1) What are the differences in the type of sulfate observed in urban vs. marine emissions? (noaa.gov)

When BC aerosol is concentrated at the top of the boundary layer, a "dome effect" is formed. (frontiersin.org)

Gannet Hallar and Timothy Onasch from Aerodyne Research were recently named the new co-chairs of the Atmospheric Radiation Measurement (ARM) user facility's Aerosol Measurement Science Group (AMSG) . (aerodyne.com)

The measurements are shown to be consistent with kinetic simulations of the slow diffusion of water within the particle bulk. (copernicus.org)

Methods and Standards for Measurement of Atmospheric Aerosol Radiative Properties - (C. Zangmeister and M. Zachariah, Materials Measurement Lab) Goal: to develop methods that facilitate the measurement of aerosol optical properties, apply these measurements to relevant atmospheric systems that improve models of radiative forcing, and develop a transferrable aerosol with known optical properties. (nist.gov)

In filter testing there are quite a few choices to make: aerosol composition, aerosol size, detector design, flow rate, etc. (tsi.com)
A phenomenological approach for quantifying the time response of particle size is used to illustrate the influence of the glassy aerosol state on the kinetics of mass transfer of water: the time is estimated for the droplet to reach the halfway point from an initial state towards a disequilibrium state at which the rate of size change decreases below 1 nm every 10 000 s. (copernicus.org)
Size resolved CCN activity and bulk chemical composition of atmospheric aerosols in the submicrometer size range were measured at Noto Ground-based Research Observatory (NOTOGRO), facing the Sea of Japan at the tip of Noto Peninsula, in autumn 2012. (aaqr.org)
The bulk chemical composition derived by an aerosol chemical speciation monitor (ACSM) also indicated the significant mass fraction of organics in the submicrometer size range. (aaqr.org)
The relationship between the estimated κ values and the CCN activation diameters suggests that organics contribute the aerosol mass especially in the size range of less than 100 nm. (aaqr.org)
Carbonaceous Aerosol Measurements - (M. Zachariah and C. Zangmeister, MML) Goal: to develop methods to decrease the uncertainty in the measurement of particle size, size distribution and shape in order to enable higher fidelity field measurements. (nist.gov)
The influence of dilution condition is known to affect the particle number size measurements of engine exhaust samples. (sae.org)
Stevens, G.A., and E.S. Moyer: "Worst case" aerosol testing parameters: I. Sodium chloride and dioctyl phthalate aerosol filter efficiency as a function of particle size and flow rate. (cdc.gov)

Initial Penetration of Charged and Neutralized Lead Fume and Silica Dust Aerosols through Clean, Unloaded Respirator Filters. (cdc.gov)

Similarities in the aerosol loading in the two hemispheres, both spatial and temporal, are evident. (ametsoc.org)

Do We Need to Challenge Respirator Filters With Biological Aerosols? (cdc.gov)
The literature cited in this Science Blog suggest that it is not necessary to test a respirator filter with a biological aerosol, but rather to focus on "worse-case" type test conditions. (cdc.gov)

Our goal is to understand the environment before the facility starts, and prepare for future measurements of ESS-specific radionuclides. (lu.se)

Accurate representations of the physicochemical properties of atmospheric aerosols: when are laboratory measurements of value? (bris.ac.uk)

In the atmospheric measurement, the CCN efficiency spectra, where the CCN number fraction is plotted against the diameter of aerosols, were obtained for four different supersaturation (SS) conditions. (aaqr.org)
The hygroscopicity parameter κ , which depends on the chemical composition of aerosols, was estimated from analysis of the CCN spectra. (aaqr.org)
Studies were conducted in three directions: the measurement of radioactive aerosol, the measurement of transition metals in soil and the simulation of gamma spectra of samples contaminated by ESS releases. (lu.se)

This work provides, on one hand, a description of long-term aerosol chemical properties at a remote regional site in central Europe and, on the other hand a characteristic chemical signature of FT aerosols over this region. (lib4ri.ch)
This data can be used to improve our understanding of the transport and aging properties of aerosols at regional observation sites. (lib4ri.ch)

S ince 2007 w e manufacture Aethalometer®, the most widely used instrument for monitoring black carbon aerosols in the air. (aerosol.si)

Anatomy7

Organisms7

Diseases14

Chemicals and Drugs56

Analytical, Diagnostic and Therapeutic Techniques and Equipment102

Phenomena and Processes55

Disciplines and Occupations10

Anthropology, Education, Sociology and Social Phenomena2

Technology, Industry, Agriculture14

Information Science10

Named Groups1

Health Care51

Particles27

Organic7

Types of workplace aerosols3

Stratospheric5

Particulate5

Cloud-Aerosol Lidar1

20161

Journal of Aerosol Science2

Atmosphere6

Carbonaceous aerosols6

Black carbon aerosol5

Abstract1

Submicron aerosol1

Characterization1

Metrology1

Sunphotometer2

Chemistry3

Relative humidity3

Heterogeneous2

Distributions3

Operational aerosol1

Concentration7

Airborne5

Soot2

Interactions1

Observations2

Uncertainties2

Extinction1

Nanoparticles1

Concentrations1

Processes3

Situ1

Clouds3

Characteristics5

Satellite measurements1

Deposition1

Aerodynamic1

Climate5

Combustion2

Inorganic1

Composition measurements1

Boundary layer1

Atmospheric Radiation M1

Simulations1

Relevant atmospheric1

Size8

Fume1

Spatial and temporal1

Biological2

Radionuclides1

Laboratory measurements1

Spectra3

Properties2

Carbon1