BronchitisBronchitis, ChronicPulmonary EmphysemaEmphysemaInfectious bronchitis virusSubcutaneous EmphysemaChronic DiseaseMediastinal EmphysemaSmokingSputumPulmonary Disease, Chronic ObstructivePulmonary Heart DiseaseRespiratory Tract DiseasesLung Diseases, ObstructiveRespiratory Function TestsForced Expiratory VolumeExpectorantsCoughSpirometryLungVital CapacityAsthmaCoronaviridaeCoronavirus InfectionsCoal MiningAirway ObstructionBronchiTextile IndustryDustFossil FuelsPneumoconiosisBronchiectasisIpratropiumOccupational DiseasesByssinosisLung DiseasesRespiratory Tract InfectionsPancreatic ElastaseSmokeAtropine DerivativesCefuroximeMucociliary ClearanceWeldingalpha 1-Antitrypsin DeficiencyRespiration DisordersAcute DiseaseAgricultural Workers' DiseasesMucusOccupational ExposureMass Chest X-RayHaemophilus influenzaeBronchoscopyPrevalenceForced Expiratory Flow RatesBronchodilator AgentsPneumoniaPoultry DiseasesBronchoalveolar Lavage FluidWaste ProductsRespiratory SoundsAir PollutionAlbuterolFarmer's LungAza CompoundsDyspneaAir Pollutants, OccupationalSulfur DioxideHeptachlorBronchiolitisAnti-Bacterial AgentsTomography, X-Ray ComputedMetallurgyTobacco Smoke PollutionAnti-Infective AgentsPneumonectomyRisk FactorsMiningalpha 1-AntitrypsinCross-Sectional StudiesYang DeficiencyLebanonLung Volume MeasurementsIntermittent Positive-Pressure BreathingAirway ResistanceGuaifenesinMethacholine CompoundsNasopharyngitisRespiratory MucosaAmbroxolAge FactorsHaemophilus InfectionsAerosolsBacterial InfectionsOccupationsEstoniaMaximal Expiratory Flow RateFluoroquinolonesPulmonary AlveoliCoronaviridae InfectionsSeverity of Illness Index