For example, an AQI value of 50 or below represents good air quality, while an AQI value over 300 represents hazardous air quality. Think of the AQI as a yardstick that runs from 0 to 500. The higher the AQI value, the greater the level of air pollution and the greater the health concern.

Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution. Active children and adults, and people with respiratory disease, such as …

Sep 18, 2024 · The Air Quality Index, or AQI, is the system used to warn the public when air pollution is dangerous. The AQI tracks ozone (smog) and particle pollution (tiny particles from smoke, power plants and factories, vehicle exhaust, and other sources), as well as four other widespread air pollutants.

This color-coded table shows generically how AQI values correlate with levels of health concern. For a copy of this AQI table, download the booklet, "Air Quality Index - A Guide to Air Quality and Your Health," that explains the AQI and the health effects of major air pollutants, at https://www.epa.gov/airnow/aqi_brochure_08-09.pdf .

Keep track of the most polluted cities in the world with our air quality index (AQI) ranking.

Eight-hour ozone averages do not define AQI values greater than 300; AQI values of 301 or greater are calculated with 1-hour ozone concentrations. 1-hour SO 2 values do not define higher AQI values greater than 200.

Feb 25, 2022 · AQI of 201 to 300 is very unhealthy for everyone and a health alert is issued. The color code is purple. AQI over 301 is hazardous for everyone and a health warning emergency is issued.

Sep 5, 2024 · Use this box for geographic or location based searches. This button allows AirNow to find the Air Quality at your current location. To use this feature you must allow AirNow to access your location in your device settings. Get air quality data where you live.

Feb 23, 2021 · When the Air Quality Index exceeds 300, it is “hazardous” for everyone and may prompt emergency condition alerts. Can the air quality index be higher than 500? “An AQI of 500 is exceptionally high.

AQI to Concentration Calculator. DIRECTIONS: Select a pollutant, then enter the AQI value. Click on “Calculate” to see the results.