Wild fires are more common than ever, especially with global warming (and yes global warming is a fact and not fake news!). The fires make the air smoky, which can irritate your airways.
The result for most people is a cough, sore throat, itchy eyes and headache
However, for those who have asthma, emphysema or other chronic lung condition, the smoke can inflame the lungs and airways to the lungs (bronchi). Wheezing with shortness of breath is the result. Sometimes, the wheezing is severe and won’t respond to the usual inhalers. In that case, it is best to just go to the ER right away.
To avoid getting into trouble on smoky days, stay indoors, preferably with air conditioning. If you must go outside, then limit the time you spend outside. Best times are early in the morning, as the levels of smoke at that time are often lower than later in the day. You can also check the internet for air quality alerts. A good site is the National Weather Service.
You can in fact exercise if you do so indoors, say at a local gym. Swimming is fine, as long as it is outdoors. Remember that young children and seniors are especially sensitive to smoke.