. . . . "The diagnosis of asthma is also suggested if the symptoms worsen with exercise, viral illness, weather changes or exposures to airborne chemicals, dust, tobacco smoke or other allergens, such as animal dander, cockroaches, house dust mites, mold and pollens (Table 1).2View/Print TableTABLE 1Environmental Triggers in Asthma and Control MeasuresPotential triggersControl measuresHouse dust miteCover" .