EPA and the National Weather Service are challenging all Americans to improve their knowledge of the Air Quality Index (AQI) during the annual "Air Quality Awareness Week" that takes place from April 28, 2008, to May 2, 2008. As warm weather approaches, using the AQI will help reduce exposure to ground-level ozone pollution. The Air Quality Index is EPA's color-coded tool for communicating air quality to the public. The most common AQI forecasts range from "code green,"--a good day to engage in outdoor activities, to "code red"--when everyone should use caution.

This summer, residents of many cities may notice more "code orange" ozone days than in the past. The potential increase in these "orange" days does not mean air quality is getting worse; it is a result of EPA's recent strengthening of the national ozone standards. However, any time air quality reaches "code orange," those sensitive to ground-level ozone should alter their outdoor activities to reduce exposure.

For more information on National Air Quality Awareness Week, see http://www.epa.gov/airnow/airaware/.