AirNow's EnviroFlash sends air quality information for your city to your email or mobile phone. Air quality forecasts and alerts allow you to adjust your plans when necessary on unhealthy air quality days. This can be especially helpful for people who are sensitive to air pollution, such as children, people with asthma, and the elderly.
AirNow is a voluntary program between the US EPA and state and local air quality agencies. It uses the Air Quality Index to report how clean or polluted the air is for pollutants such as ozone and particulate matter.