 [ Symptoms ] what is the worst weather for exercising outdoors with allergies [ Disease ] avoid outdoor exercise on dry warm windy days which bring the highest pollen levels the wind blows pollen around for miles and miles  blaiss says many pollens cause eye problems including allergic conjunctivitis a noncontagious form of pink eye  blaiss says high humidity can cause problems as well the humidity itself is not bad but if the air feels heavy it can make breathing feel difficult  michael blaiss md a past president of the american college of allergy asthma & immunology acaai and a practicing allergist in memphis tenn says plus the humidity contributes to mold growth which can trigger symptoms in people with mold allergies  on the other hand a rain shower may help rain clears the air making it a good time to go outdoors if you have allergies he adds running in cold weather may also trigger symptoms  blaiss says problems of that type usually result from exercise induced bronchospasm a sudden constriction of airway passages in the lungs however which is not a true allergy blaiss says with proper treatment you should be able to do any sport or activity without a problem if not you may need a reevaluation of your treatment plan 