- Children—Active children run the highest risks from exposure to smog. Children spend a lot of time playing outside, especially during summer vacation from school when smog is most likely to be a problem. As a group, children are also more prone to asthma—the most common chronic disease for children—and other respiratory ailments than adults.
- Adults who are active outdoors—Healthy adults of any age who exercise or work outdoors are considered at higher risk from smog than people who spend more time indoors, because they have a higher level of exposure.
- People with respiratory diseases—There is no medical evidence that the ozone in smog causes asthma or other chronic respiratory diseases, but people who live with such diseases are more sensitive and vulnerable to the effects of ozone. Typically, they will experience adverse effects sooner and at lower levels of exposure than those who are less sensitive.
- People with unusual susceptibility to ozone—Some otherwise healthy people are simply more sensitive to ozone and other pollutants in smog than other people, and may experience more adverse health effects from exposure to smog than the average person.
Smog: Frequently Asked Questions