People often think of asthma more in terms of kids and in conjunction with allergies. That's not surprising, because asthma is the most common chronic illness in children. Plus, the most common triggers for asthma symptoms are substances known as allergens, such as pollen, animal dander, dust and molds.

But adults can also have asthma, and the underlying cause is not always allergic. Many times, it can be something in your work environment that triggers those annoying asthma symptoms, such...