What are common triggers for allergic reactions and asthma?

Many different...: ...Triggers - of foods, nuts and fish/seafood are more common; of airborne triggers, smoke, dust, pollens and animal dander (cats are most severe).

Allegens & irritiant: Allergens: house dust mites, animal danders, mold spores, pollens & sometimes foods. Irritants: cigarette smoke, wood & barbecue smoke, poorly-burning gas stoves, heaters, furnaces & hot water heaters, smog, diesel exhausts, pesticides, fragrance. For asthma these physical triggers: cold air, exercise, laughter, stress, and respiratory infections, especially viral respiratory infections.

Triggers...: Common triggers for allergic reactions and asthma include pollen, mold, pet dander, dust, insect bites/stings, foods, ozone, cigarette smoke, cold air, exercise, meds, etc.