United States of America
Air Quality Index
Air Quality Index, USA
- Ground-level ozone
- Particle pollution (also known as particulate matter, including PM2.5 and PM10)
- Carbon monoxide
- Sulfur dioxide
- Nitrogen dioxide
Basics of AQI
|Air Quality Index (AQI) Values||Levels of Health Concern||Colors|
|0 - 50||Good|
|51 - 100||Moderate|
|101 - 150||Unhealthy for Sensitive Groups|
|151 - 200||Unhealthy|
|201 - 300||Very Unhealthy|
|301 - 500||Hazardous|
Reference – https://www.airnow.gov/aqi/aqi-basics/
Understanding Health concerns related to different Air Pollution levels
- Good: Air quality is satisfactory and poses little or no health risk.
- Moderate: Air quality is acceptable, but pollution in this range may cause a moderate health concern for a small number of individuals. People who are sensitive to ozone or particle pollution may experience respiratory symptoms.
- Unhealthy for Sensitive Groups: Members of sensitive groups may experience health effects, but the general public is unlikely to be affected.
- Unhealthy: Everyone may begin to experience health effects. Members of sensitive groups may expose to more serious health effects.
- Very Unhealthy: It triggers a health alert, meaning everyone may experience more serious health effects.
- Hazardous: Triggers health warnings of emergency conditions. The population is even more likely to be affected by serious health effects.
Five major pollutants
- i. Ground-level ozone
- ii. Particulate matter (including PM2.5 and PM10)
- iii. Carbon monoxide
- iv. Sulfur dioxide
- v. Nitrogen dioxide
Advisory for different AQI Levels
|Air Pollution Level||Advisory|
|Moderate & Unhealthy for Sensitive Groups||Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.|
|Unhealthy & Very Unhealthy||Active children and adults, and people with respiratory disease, such as asthma, should avoid prolonged outdoor exertion; everyone else, especially children, should limit prolonged outdoor exertion.|
|Hazardous||Everyone should avoid all outdoor exertion.|
For Pollutant-Specific Sub-indices and guidance on the Air Quality Index (AQI) – click here.