Topic summary
Air quality
Extracted from the Wikipedia article Air pollution.
Monitoring
Air quality indexes (AQIs) offer a simple way to communicate changes in air quality and associated health risks to a wide audience. An AQI is essentially a health protection tool people can use to help reduce their short-term exposure to air pollution by adjusting activity levels during increased levels of air pollution. These indexes can indicate when air quality is good, when it is dangerous for sensitive groups (e.g. children with asthma) and when it is a general hazard.