People frequently blame air pollution for causing asthma, but its role is not entirely clear.

How can you tell if your child's allergies are causing asthma?

There are some things that may cause occupational asthma and certain professions in which people might be exposed to them.

These substances may cause asthma in one of 3 ways:

Thujone can cause low blood pressure, asthma, seizures, and death.

A study of children living in Southern California found that smog can cause asthma.

Carmine has been found to cause asthma in some people.

"Now I know that certain things can cause asthma, and try to avoid them."

Still, there are many explanations for what may cause nocturnal asthma.

It has also been suggested that candidiasis can cause asthma, although only very rarely.