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The Air Quality Index (AQI) is a standardized indicator of the air quality in a given location. It measures mainly ground-level ozone and particulates (except the pollen count), but may also include sulphur dioxide, and nitrogen dioxide. Various agencies around the world measure such indices, though definitions may change between places.

The U.S. Environmental Protection Agency and the Meteorological Service of Canada (MSC) differ on what AQI structure and health classification is used:

Health classifications used by the EPA:

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Air Quality Index - Twitter Search

RT @VancouverAQHI: Air Quality Health Index throughout Lower FV and Metro Van is LOW today. Learn more about your community...
BCLungAssoc (BC Lung Association) Wed, 16 Dec 2009 16:51:10 -0000
RT @VancouverAQHI: Air Quality Health Index throughout Lower FV and Metro Van is LOW today. Learn more about your community...
Washoe County Issues Another Red Burn Ban: Air Quality Index (AQI) levels include zero to 50 equals good air qualit... http://bit.ly/6NI0Vd
thegreengod (thegreengod) Wed, 16 Dec 2009 16:24:53 -0000
Washoe County Issues Another Red Burn Ban: Air Quality Index (AQI) levels include zero to 50 equals good air qualit... http://bit.ly/6NI0Vd
Air Quality Health Index throughout Lower FV and Metro Van is LOW today. Learn more about your community http://bit.ly/16wbvo
vancouveraqhi (Vancouver AQHI) Wed, 16 Dec 2009 16:18:39 -0000
Air Quality Health Index throughout Lower FV and Metro Van is LOW today. Learn more about your community http://bit.ly/16wbvo
Air Quality Health Index in Victoria is 2 and forecast to stay low. Learn more about air & your health at http://bit.ly/L4fVG
victoriaaqhi (Victoria AQHI) Wed, 16 Dec 2009 16:11:24 -0000
Air Quality Health Index in Victoria is 2 and forecast to stay low. Learn more about air & your health at http://bit.ly/L4fVG
khou.com weather: Weather Index Radars Hurricane Central Air Quality . Title: KHOU.com ... KHOU: Hurricane Central ... http://bit.ly/52jmjt
adainvest (Anthony Orlando) Mon, 14 Dec 2009 19:25:39 -0000
khou.com weather: Weather Index Radars Hurricane Central Air Quality . Title: KHOU.com ... KHOU: Hurricane Central ... http://bit.ly/52jmjt
Air Quality Health Index for PG is 2 and is forecast to be 3 later today/tonight. Learn more about air and health http://bit.ly/Dk1si
PGAQHI (Prince George AQHI) Fri, 11 Dec 2009 18:08:08 -0000
Air Quality Health Index for PG is 2 and is forecast to be 3 later today/tonight. Learn more about air and health http://bit.ly/Dk1si

 
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