An Air Quality Alert is in effect for the valley through Friday evening.
The Air Quality Index forecast is 115, which means air is unhealthy for sensitive groups. The main pollutant is ozone.
Active children and adults, as well as people with lung diseases, like asthma, should reduce prolonged or heavy exertion outdoors.
Ozone in the air we breathe can cause serious health problems, including breathing difficulty, asthma attacks, lung damage, and early death. Ozone forms in the sun, usually on hot summer days. Ozone is worse in the afternoon and early evening, so plan outdoor activities for the morning.