Air MicrobiologyScattering, RadiationAerosol PropellantsNebulizers and VaporizersParticle SizeAdministration, InhalationHepatocyte Growth FactorAcid RainAtmosphereInhalation ExposureHumidityLungAir MovementsPhantoms, ImagingProto-Oncogene Proteins c-metGamma CamerasSulfuric AcidsPowdersTechnetium Tc 99m PentetateAir Pollutants, OccupationalEquipment DesignSmogEnvironmental MonitoringTechnetiumAir PollutantsFiltrationNasal SpraysRespiratory Protective DevicesCone-Beam Computed TomographyTomography, Emission-Computed, Single-PhotonBeclomethasoneMetered Dose InhalersAlbuterolMeteorologyVentilationParticulate MatterDry Powder InhalersBronchodilator AgentsMonte Carlo MethodChlorofluorocarbonsRespiratory SystemAsthmaContainment of BiohazardsCromolyn SodiumAtmosphere Exposure ChambersDioctyl Sulfosuccinic AcidDustImage Processing, Computer-AssistedWindOccupational ExposureArtifactsCoughModels, StructuralLightRespiratory TherapyAir ConditioningLaboratory InfectionTime FactorsAir Pollution, IndoorThreshold Limit ValuesRadiographic Image EnhancementPentanesKryptonFlow CytometryBiological Warfare AgentsCopying ProcessesMucociliary ClearanceMasksFenoterolSootIndustrial OilsChlorofluorocarbons, MethaneBronchial SpasmBronchiIpratropiumOrganic ChemicalsGasesEquipment Failure AnalysisReproducibility of ResultsGuinea PigsDrug Delivery SystemsAirway ResistanceGermaniumRadionuclide ImagingModels, TheoreticalManikinsSpacecraftPhotonsAlgorithmsOvalbuminAdministration, IntranasalModels, AnatomicPhysical PhenomenaTechnology, RadiologicPasteurella InfectionsTechnology, PharmaceuticalMetallurgyComputer SimulationPhysicsAir