Particle SizeAir MicrobiologyPositron-Emission TomographyNebulizers and VaporizersAerosol PropellantsVehicle EmissionsOtoacoustic Emissions, SpontaneousAtmosphereAdministration, InhalationInhalation ExposureAir PollutantsTomography, Emission-ComputedEnvironmental MonitoringParticulate MatterAir MovementsVirionRadiopharmaceuticalsFluorodeoxyglucose F18Acid RainHumidityAir Pollutants, OccupationalPowdersLungTomography, Emission-Computed, Single-PhotonNanoparticlesMicroscopy, ElectronSignal Recognition ParticleAerosolsGreenhouse EffectSpectrometry, FluorescenceFiltrationSulfuric AcidsVentilationPentanesEquipment DesignFluorine RadioisotopesCoalTechnetium Tc 99m PentetateVirus AssemblyRespiratory Protective DevicesDustGasesTime FactorsSmogMicrospheresVolatilizationAir Pollution, IndoorVaccines, Virus-Like ParticleCarbonAir PollutionPower PlantsSubmitochondrial ParticlesCell LineSootGasolineCarbon FootprintNasal SpraysTemperatureMicroscopy, Electron, ScanningMethaneColloidsModels, TheoreticalFossil FuelsDrug Delivery SystemsDry Powder InhalersSilicon DioxideFluorescent DyesFreeze FracturingMetered Dose InhalersPolystyrenesAlpha ParticlesTechnology, PharmaceuticalAtmosphere Exposure ChambersBeclomethasoneCapsidVolatile Organic CompoundsOrganic ChemicalsMolecular Sequence DataTechnetiumMultimodal ImagingSurface PropertiesMeteorologyAlbuterolTomography, X-Ray ComputedCarbon RadioisotopesCentrifugation, Density GradientSpectrometry, X-Ray EmissionRespiratory SystemBrainChemistry, PharmaceuticalWindLatexChlorofluorocarbonsCapsid ProteinsModels, BiologicalDrug CarriersThreshold Limit ValuesAsthmaMicroscopy, Electron, TransmissionFluorescence