Air MicrobiologyNebulizers and VaporizersAerosol PropellantsParticle SizeAdministration, InhalationReproducibility of ResultsAcid RainAtmosphereInhalation ExposureHumidityLungAir MovementsEnvironmental MonitoringEquipment DesignAir Pollutants, OccupationalTime FactorsTechnetium Tc 99m PentetatePowdersSulfuric AcidsAir PollutantsSmogSensitivity and SpecificityFiltrationRespiratory Protective DevicesObserver VariationVentilationNasal SpraysOccupational ExposureParticulate MatterAsthmaAlbuterolReference ValuesCalibrationBeclomethasoneMeteorologyDustMetered Dose InhalersBronchodilator AgentsRespiratory SystemModels, BiologicalAlgorithmsDry Powder InhalersChlorofluorocarbonsGasesWindProspective StudiesAir Pollution, IndoorModels, TheoreticalDioctyl Sulfosuccinic AcidAtmosphere Exposure ChambersTemperatureAirway ResistanceLung Volume MeasurementsCromolyn SodiumContainment of BiohazardsRespiratory Function TestsImage Processing, Computer-AssistedAirAnalysis of VarianceModels, AnatomicCoughTechnetiumThreshold Limit ValuesKineticsOrganic ChemicalsImaging, Three-DimensionalWaterComputer SimulationPentanesMethodsPressureDisease Models, AnimalLuminescent MeasurementsKryptonAir ConditioningGuinea PigsEquipment Failure AnalysisBronchiSpacecraftPredictive Value of TestsOxygenRespiratory TherapyRespirationBiological MarkersMasksSootAnthropometryIndustrial OilsMucociliary ClearanceRespiratory MechanicsMetallurgyBlood Flow VelocityPhysicsForced Expiratory VolumePhysical PhenomenaChlorofluorocarbons, MethaneLaboratory InfectionDrug Delivery SystemsBlood Pressure DeterminationCopying Processes