BronchitisBronchitis, ChronicInfectious bronchitis virusChronic DiseasePulmonary Disease, Chronic ObstructiveSputumAsthmaExpectorantsLung Diseases, ObstructiveRespiratory Tract DiseasesForced Expiratory VolumeCoughPulmonary EmphysemaSmokingEmphysemaPulmonary Heart DiseaseCoronaviridaeRespiratory Function TestsCoronavirus InfectionsSpirometryVital CapacityAcute DiseaseRespiratory Tract InfectionsBronchiectasisBronchodilator AgentsBronchiTextile IndustryIpratropiumFossil FuelsDustCefuroximeAirway ObstructionCoal MiningLungByssinosisMucociliary ClearanceOccupational DiseasesMucusAtropine DerivativesPneumoconiosisAlbuterolRespiration DisordersWeldingLung DiseasesPoultry DiseasesHaemophilus influenzaeAgricultural Workers' DiseasesRespiratory SoundsAnti-Bacterial AgentsOccupational ExposureForced Expiratory Flow RatesMass Chest X-RayAdrenal Cortex HormonesPrevalenceAir PollutionPeak Expiratory Flow RateAdministration, InhalationPneumoniaAza CompoundsDyspneaWaste ProductsDouble-Blind MethodBronchiolitisBronchoscopyFarmer's LungSulfur DioxideAnti-Infective AgentsBacterial InfectionsNasopharyngitisAir Pollutants, OccupationalSeverity of Illness IndexProspective StudiesRisk FactorsCoronaviridae InfectionsAmoxicillin-Potassium Clavulanate CombinationMetallurgyCross-Sectional StudiesBronchoalveolar Lavage FluidTreatment OutcomeDisease ProgressionGuaifenesinCystic FibrosisTobacco Smoke PollutionHaemophilus InfectionsSmokeHospitalizationMaximal Expiratory Flow RateYang DeficiencyLebanonHeptachlorAmbroxolFluoroquinolonesMethacholine ChlorideIntermittent Positive-Pressure BreathingMethacholine CompoundsTachypneaAge FactorsChickensRhinovirusMining