Did you know that cold and dry air can exacerbate breathing problems during exercise? During exercise we often breathe through our mouths. Breathing through the nose helps to moisten and warm up the air. Breathing through our mouths results in colder and drier air hitting the lungs. When this air meets the moist air in the lungs an asthma attack can occur for those prone to exercise induced asthma. Asthma causes temporary inflammation and narrowing of the air passages. This can present as wheezing, coughing, shortness of breath and chest tightness. There are many causes of exercise induced asthma, but they mainly fall in to two categories - allergens and irritants.
Allergens
seasonal pollens
dust mites, molds, pets and insect paarts (Yuck! This includes cockroaches too! Double yuck!!!)
fish, eggs, peanuts, nuts, cow's milk and soy (Vegan's have an advantage here)
additives (eg. sulphites - regularly found in dried fruits!)
latex (alternatives to latex first aid gloves may be a good idea)
Irritants
respiratory infections (viral colds, bronchitis and sinusitis - bear this in mind when you wonder whether to push through training when you are unwell)
drugs such as aspirin, NSAIDs and beta blockers (Ibuprofen falls in to this category!)
tobacco smoke
paints, detergents, spray deodorants, chemicals and perfumes
exercise in cold and dry conditions
laughing, crying, yelling and distress (I guess these cause your windpipe to go in to spasm)
hormonal factors such as premenstrual syndrome