Toluene 2,4-DiisocyanateAsthmaStatus AsthmaticusAnti-Asthmatic AgentsCupressaceaeFraxinusBetulaBronchodilator AgentsPeak Expiratory Flow RateWeatherAdministration, InhalationPuerto RicoRespiratory SoundsAllergensParisForced Expiratory VolumeNebulizers and VaporizersAdrenal Cortex HormonesAcute DiseaseNitrogen DioxideAir Pollution, IndoorAdrenergic beta-AgonistsAir PollutionSkin TestsPrevalenceAir PollutantsSeverity of Illness IndexPollenIschemic Attack, TransientAsthma, Exercise-InducedSeasonsEmergency Service, HospitalGlucocorticoidsQuestionnairesHospitalizationAsthma, OccupationalUrban PopulationBronchial HyperreactivityRisk FactorsPoaceaePatient ComplianceFungiHypersensitivityCross-Sectional StudiesSex DistributionHealth SurveysHypersensitivity, ImmediateAge FactorsEpidemiologic MethodsAge DistributionTime FactorsRespiratory Function TestsFamily PracticeComplement Membrane Attack ComplexAlbuterolRhinitisEuropeMethacholine ChlorideRetrospective StudiesRhinitis, Allergic, PerennialPhysician's Practice PatternsSpirometryBrazilBudesonideEosinophilsBronchiSeptember 11 Terrorist AttacksLeukotriene AntagonistsBeclomethasoneLungBronchoconstrictor AgentsAirway RemodelingBronchitisBronchoconstrictionTerrorismRespiratory HypersensitivityOvalbuminPyroglyphidaePulmonary MedicineVital CapacityAsthma, Aspirin-InducedSputumMitesCoughMigraine DisordersBronchoalveolar Lavage FluidAirway ObstructionOccupational DiseasesExhalationEnvironmental ExposureAnti-Inflammatory AgentsDouble-Blind MethodEosinophilia