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The Air Quality Index

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    The Air Quality Index (AQI) (also known as the Air Pollution Index (API) or Pollutant Standard Index (PSI) is a number used by government agencies to characterize the quality of the air at a given location.
    Air pollution is the introduction of chemicals, particulate matter,
    or biological materials that cause harm or discomfort to humans or
    other living organisms, or damages the natural environment into
    the atmosphere. The atmosphere is a complex dynamic natural gaseous system
    that isessential to support life on planet Earth. Stratospheric ozone
    depletion due to air pollution has long been recognized as a threat to
    human health as well as to the Earth’s ecosystems.
    The Air Quality Index (AQI) (also known as the Air Pollution
    Index(API) or Pollutant Standard Index(PSI) is a number used by
    government agencies to characterize the quality of the air at a given
    location and reporting daily air quality. As the AQI increases, an
    increasingly large percentage ofthe population is likely to experience
    increasingly severe adversehealth effects. To compute the AQI requires
    an air pollutantconcentration from a monitor or model. The function used to
    convert from air pollutant concentration to AQI varies by pollutant, and is
    different in different countries. Air quality index values are divided
    into ranges, and each range is assigned a descriptor and a color code.
    Standardized public health advisories are associated with each AQI
    range. An agency might also encourage members of the public to take
    public transportation or work from home when AQI levels are high.

    Limitations of the AQI
    Most air contaminants do not have an associated AQI. Many countries
    monitor ground-level ozone, particulates, sulphur dioxide, carbon
    monoxide and nitrogen dioxide and calculate air quality indices for
    these pollutants.

    Causes of Poor Air Quality
    The AQI can worsen (go up) due to lack of dilution of air emissions
    by fresh air. Stagnant air, often caused.

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    The Air Quality Index. (2018, Aug 23). Retrieved from

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