jungle lady is right on. exercise in early morning or evening, before and after the day. the problem gets worse as the morning dew evaporates and as it rises it brings the allergens with it. i have seasonal exercise induced asthma. it is made worse with dehydration. Rx's like singulair and accolate act as do the long acting inhalers like serevent or flovent.
as more and more people move out to the dessert and suburban lawns and gardens pop up, even these places get significant allergies and pollution rates.