BronchitisBronchitis, ChronicInfectious bronchitis virusChronic DiseaseSputumRespiratory Tract DiseasesPulmonary EmphysemaExpectorantsLung Diseases, ObstructiveEmphysemaPulmonary Heart DiseaseSmokingCoughAsthmaPulmonary Disease, Chronic ObstructiveForced Expiratory VolumeCoronaviridaeRespiratory Function TestsSpirometryCoronavirus InfectionsTextile IndustryVital CapacityFossil FuelsDustByssinosisBronchiIpratropiumBronchiectasisCoal MiningRespiratory Tract InfectionsOccupational DiseasesAtropine DerivativesCefuroximeMucociliary ClearanceWeldingPneumoconiosisAgricultural Workers' DiseasesAirway ObstructionAcute DiseaseRespiration DisordersMucusLung DiseasesOccupational ExposureMass Chest X-RayHaemophilus influenzaeLungForced Expiratory Flow RatesPoultry DiseasesWaste ProductsPrevalenceAir PollutionRespiratory SoundsFarmer's LungBronchodilator AgentsAza CompoundsAir Pollutants, OccupationalSulfur DioxideHeptachlorAlbuterolBronchiolitisAnti-Bacterial AgentsMetallurgyAnti-Infective AgentsPneumoniaBronchoscopyYang DeficiencyLebanonIntermittent Positive-Pressure BreathingGuaifenesinMethacholine CompoundsCross-Sectional StudiesNasopharyngitisAmbroxolMiningSmokeHaemophilus InfectionsBacterial InfectionsOccupationsEstoniaRisk FactorsMaximal Expiratory Flow RateTobacco Smoke PollutionFluoroquinolonesCoronaviridae InfectionsDouble-Blind MethodMethacholine ChlorideBronchoalveolar Lavage FluidPeak Expiratory Flow RateAmoxicillin-Potassium Clavulanate CombinationWalesAge FactorsAir Pollution, IndoorHealthy Worker EffectDyspneaGossypiumPropaneTracheaInhalation ExposureHaemophilus parainfluenzae