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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 - Google News

Air-quality alert in effect for Stark County - Canton Repository (subscription)
Fri, 05 Sep 2008 04:37:18 -0000
Air-quality alert in effect for Stark CountyCanton Repository (subscription), OH - 10 hours agoThe city's air-quality index, which measures air healthiness, hit 109 on Wednesday, prompting the first health advisory of the year for Stark County for ...
Air quality alert in effect today - The Newark Advocate
Thu, 04 Sep 2008 10:59:47 -0000
Air quality alert in effect todayThe Newark Advocate, OH - Sep 4, 2008The region will likely have ground-level ozone pollution levels that are considered unhealthy for sensitive groups on the national Air Quality Index scale. ...
Official: Beijing air pollution index down more than 20 percentage ... - Xinhua
Sat, 23 Aug 2008 07:05:56 -0000
HispanicBusiness.comOfficial: Beijing air pollution index down more than 20 percentage ...Xinhua, China - Aug 23, 200823 (Xinhua) -- The Air Pollution Index (API) in the Olympic host city has dropped by more than 20 percentage points compared with the same period last year, ...China's dilemma: good air versus industry Sydney Morning HeraldClean-air measures to remain after Games China DailyBlue Skies for Beijing Need Marathon Plan That May Slow Economy BloombergChristian Science Monitor - Grist Magazineall 198 news articles
Air Quality Action Day Forecast Wednesday for Pittsburgh Region - MarketWatch
Tue, 02 Sep 2008 20:17:24 -0000
Air Quality Action Day Forecast Wednesday for Pittsburgh RegionMarketWatch - Sep 2, 2008The US Environmental Protection Agency's standardized air quality index uses colors to report daily air quality (green signifies good, yellow means moderate ...
PSEG Added to Dow Jones Sustainability Index - MarketWatch
Thu, 04 Sep 2008 17:11:48 -0000
PSEG Added to Dow Jones Sustainability IndexMarketWatch - 22 hours agoThe DJSI measures the quality of a company's strategy and management and its performance in dealing with opportunities and risks deriving from economic, ...
Air Quality Health Advisory Issued for New York State - ReadMedia (press release)
Wed, 03 Sep 2008 19:46:49 -0000
Air Quality Health Advisory Issued for New York StateReadMedia (press release), NY - Sep 3, 2008... DEC meteorologists predict levels of pollution, either ozone or fine particulate matter are expected to exceed an Air Quality Index (AQI) value of 100. ...

 
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This video is lousy quality, audio is horrible also...however it is important. Keith Olbermann (MSNBC Anchor and Bill O ...
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