Air Quality Information

Poor air quality often afflicts Sequoia and Kings Canyon National Parks, especially during summer. High ozone levels may be the most harmful pollutant here. In summer months, concentrations often exceed the federal ozone health standards. Ozone can have negative health efects, particularly for sensitive groups such as children, older people, and those with heart or lung disease.

Daily Air Quality Forecasts

Below are the most recent air quality forecasts sent via Twitter by the parks' Air Resource Advisors during the summer months. The date of the last forecast is in the lower right of each tweet.

During summer, generally May to October, these parks post daily and weekend air-quality forecasts to inform visitors and staff of expected conditions. Two forecasts are given, because lower elevations in the foothills experience different air quality than montane middle elevations. Higher elevations (above 8500 feet) typically retain good air quality, even when lower-elevation monitors show poor air quality. Unless otherwise noted, the park air-quality forecast is for ozone only.