Are you having problems controlling your asthma when you are exercising? According to fitness expert Norman Hurst

There are some things that you can do to prevent an asthma attack while exercising – The first thing to do is to stop smoking.  Having a cigarette and then deciding to go for a jog is one sure way to trigger an asthma attack. You might also want to restrict your jogging, biking or running to days where there is not a high pollution index as that can cause an attack as well. As pets can also trigger asthma attacks it is best not to engage in vigorous exercise while walking your pets. 

Being less active during allergy season in general might also be a good idea. There are medications that you can take as well that can help lower your risk of having an attack while exercising. As exertion can trigger an attack keeping these medications in your pocket is a good idea just in case.