[nynor]

yeah, there is such a thing as cold induced asthma and exercise induced asthma. you could probably talk to your doctor about it. a PRN dose of albuterol, right before exercising, would probably be all that you need. also, you could try a LONGER, much LONGER, warmup period.

cold air is not necessarily cleaner. part of the problem, re the above, is that colder air is dryer, along with being irritating to your airways. your lungs require air that is body temperature and 100% humidified, which is the job of your upper airway (nose and mouth) all the way to the carina (where your trachea branches into the two mainstems/lungs).