People whose health is affected by unhealthy air quality: There are people who are more likely to be affected when fine particle pollution reaches an unhealthy level.
- People who have asthma or other breathing conditions like chronic obstructive pulmonary disease (COPD)
- People who have heart disease or high blood pressure
- Children and older adults
- People of all ages who are doing extended or heavy, physical activity like playing sports or working outdoors
