Today and Tomorrow's Air Quality Forecasts -
EPA's updated AirNow website provides forecasts and
easy-to-understand maps updated on an hourly basis on ozone air
quality information from monitors in 39 states and Washington,
D.C. (Alabama, Arizona, Arkansas, California, Connecticut,
Delaware, District of Columbia, Florida, Georgia, Illinois,
Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland,
Massachusetts, Michigan, Minnesota, Mississippi, Missouri, New
Hampshire, New Jersey, New York, Nevada, North Carolina, Ohio,
Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina,
Tennessee, Texas, Vermont, Virginia, Washington, West Virginia,
Wisconsin). Within the next month, Idaho, New Mexico and Colorado
are expected to be added. The expanded website will also include
same day and next day forecasts for over 160 cities across the
country.
These forecasts are based on EPA's Air Quality Index (AQI), which
uses a color-coding system to rate air quality as good (green),
moderate (yellow), unhealthy for sensitive groups (orange),
unhealthy (red), very unhealthy (purple) or hazardous (maroon);
the AQI also provides cautionary health statements for each
rating. EPA shares the AQI forecasts for all major cities in the
United States with weather service providers who make the
information available to newspapers, television and radio.
Smog is created by a chemical reaction between nitrogen oxides
and volatile organic compounds in the presence of sunlight. When
inhaled - even at very low levels - smog can cause acute
respiratory problems, aggravate asthma, reduce lung capacity,
inflame lung tissue and impair the body's immune system. Click here for forecasts.