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  1. www.iqair.com › newsroom › what-is-aqiWhat is the air quality index (AQI)? | IQAir

    Aug 4, 2018 · The index represents air pollutant concentrations with a number falling within a range of air quality categories. Within each category and number range, elevated health risks associated with rising air pollutant concentrations are identified. The air quality index ranges from 0 to 500, though air quality can be indexed beyond 500 when there are ...

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  3. uk-air.defra.gov.uk › air-pollution › daqiDaily Air Quality Index - Defra, UK - GOV.UK

    The index is numbered 1-10 and divided into four bands, low (1) to very high (10), to provide detail about air pollution levels in a simple way, similar to the sun index or pollen index. You should follow the 3 steps below to use the Daily Air Quality Index. Step 1: Determine whether you (or your children) are likely to be at-risk from air ...

  4. www.iqair.com › ukUnited Kingdom Air Quality Index (AQI) and Air Pollution ...

    The DAQI bands air quality levels along a scale of 1-10, which corresponds to different health hazard warning related to air pollution levels, where 1-3 is ‘Low’, 4-6 is ‘Moderate’, 7-9 is ‘High’, and 10 is ‘Very high’. 14. The UK is also home to numerous low-cost sensors which are operated by a range of private individuals and ...

  5. uk-air.defra.gov.uk › air-pollution › daqiWhat is the Daily Air Quality Index? - Defra, UK - GOV.UK

    Defra has written a report describing how the index has been implemented, including details on use of the running 24-hour mean for the latest monitoring data on UK-AIR and the use of triggers to predict air pollution episodes. This report describes updates to the thresholds used and may be of interest to air quality data providers.

  6. www.iqair.com › world-air-quality-rankingWorld Air Quality Index (AQI) Ranking | IQAir

    • Dhaka, Bangladesh. 273. 212.8K followers.
    • Shanghai, China. 199. 1.9M followers.
    • Kolkata, India. 198. 1.4M followers.
    • Delhi, India. 189. 2.7M followers.

  7. www.airnow.gov › aqi › aqi-basicsAir Quality Index (AQI) Basics - AirNow

    The U.S. Air Quality Index (AQI) is EPA's tool for communicating about outdoor air quality and health. The AQI includes six color-coded categories, each corresponding to a range of index values. The higher the AQI value, the greater the level of air pollution and the greater the health concern. For example, an AQI value of 50 or below ...

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  9. en.wikipedia.org › wiki › Air_quality_indexAir quality index - Wikipedia

    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 respiratory ...

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