Listed below are the Air Quality Index (AQI) calendars which use the 1997 standard of 85 ppb (years 2001-2007).
AQI calendars graphically present the maximum daily eight-hour ozone AQI values for April-October. The Environmental Protection Agency (EPA) AQI conversion calculator is used to convert daily maximum eight-hour ozone averages into an AQI assigned by color-coded general health categories. An AQI of 100 corresponds to the 1997 eight-hour ozone standard. Any value greater than that is considered to be unhealthy.