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  2. List of most-polluted cities by particulate matter concentration

    en.wikipedia.org/wiki/List_of_most-polluted...

    The 2018 version of the WHO database contains results of ambient (outdoor) air pollution monitoring from almost 2700 towns and cities in 91 countries. Air quality in the database is represented by the annual mean concentration of particulate matter (PM10 and PM2.5, i.e. particles smaller than 10 or 2.5 micrometers, respectively). [1] [2] [3]

  3. Air quality index - Wikipedia

    en.wikipedia.org/wiki/Air_quality_index

    An air quality index (''AQI') is an indicator developed by government agencies [ 1 ] to communicate to the public how polluted the air currently is or how polluted it is forecast to become. [ 2 ][ 3 ] As air pollution levels rise, so does the AQI, along with the associated public health risk. Children, the elderly and individuals with ...

  4. Air Quality Health Index (Canada) - Wikipedia

    en.wikipedia.org/wiki/Air_Quality_Health_Index...

    The Air Quality Health Index ( AQHI) is a scale designed in Canada to help understand the impact of air quality on health. It is a health protection tool used to make decisions to reduce short-term exposure to air pollution by adjusting activity levels during increased levels of air pollution. The Air Quality Health Index also provides advice ...

  5. How to understand the Air Quality Index - AOL

    www.aol.com/news/how-to-understand-the-air...

    The AQI uses a scale that typically ranges from zero to 500 to denote air quality. If your area has an AQI of 50 or below, you're in a green zone. You should have good air quality and little or no ...

  6. How to understand Air Quality Index alerts for NYC and the ...

    www.engadget.com/how-to-understand-the-air...

    When the index reaches a value of between 51 and 100, that's a code yellow, which is moderate cause for concern. The EPA says that in this range, air quality is acceptable, but there may be a ...

  7. What is the Air Quality Index? - AOL

    www.aol.com/news/air-quality-index-183148527.html

    “The U.S. Air Quality Index is getting a lot of media attention right now, but it is really fantastic,” Dr. Brady Scott, a fellow at the American Association for Respiratory Care, told Yahoo News.

  8. How to tell if the air around us is safe to breathe - Engadget

    www.engadget.com/how-to-tell-if-the-air-around...

    You can get even more localized details with the use of a personal AQI monitor. The Kaiterra Laser Egg+ monitors your indoor air quality as well as tracks the concentration of PM2.5, volatile ...

  9. Cincinnati weather: Air quality alert in effect ... - AOL

    www.aol.com/cincinnati-weather-air-quality-alert...

    An air quality index level of 100 is considered safe. An AQI under 100 is good or acceptable, and an AQI over 100 is cause for concern, especially for vulnerable groups. Levels over 300 indicate ...