I hunted for what triggers Asthma attacks. Of a dozen or more I looked at, only 2 mentioned (outdoors) air pollution. Even the mothers site was like the others, listing allergies, pets, pests, tobacco smoke, bugs, dust, but not air quality.
If you never learned anything from this site, please learn that CO2, industrial smoke, car exhaust belong in the list. People living in polluted areas, near highways, smoke belching industry, have more events than those who do not. Only the American Lung Association is clear about this.
Treating the symptom fills cash registers. Reducing some of the sources of the disease reduces drug companies profits. Who you want to hurt, kids, or profit? I went to some of these sites and used the "contact us" form to abuse them for their oversight and asking them to list air quality as a trigger. Work towards cleaner air, harp about to anyone you can corner, lungs need your help.