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  2. Air quality index - Wikipedia

    en.wikipedia.org/wiki/Air_quality_index

    The score for each pollutant is non-linear, as is the final AQI score. Thus an AQI of 300 does not mean twice the pollution of AQI at 150, nor does it mean the air is twice as harmful. The concentration of a pollutant when its IAQI is 100 does not equal twice its concentration when its IAQI is 50, nor does it mean the pollutant is twice as harmful.

  3. Pollutant Standards Index - Wikipedia

    en.wikipedia.org/wiki/Pollutant_Standards_Index

    The Pollutant Standards Index (PSI) is a type of air quality index used in Singapore, which is a number used to indicate the level of pollutants in air.Initially PSI was based on five air pollutants, but since 1 April 2014 it has also included fine particulate matter (PM 2.5).

  4. Particulate pollution - Wikipedia

    en.wikipedia.org/wiki/Particulate_pollution

    In 2006, the EPA conducted air quality designations in all 50 states, denoting areas of high pollution based on criteria such as air quality monitoring data, recommendations submitted by the states, and other technical information; and reduced the National Ambient Air Quality Standard for daily exposure to particulates in the 2.5 micrometers ...

  5. NowCast (air quality index) - Wikipedia

    en.wikipedia.org/wiki/NowCast_(air_quality_index)

    PM 2.5 AQI of US monitors, calculated utilizing NowCast, courtesy US EPA PM2.5 AQI map, calculated utilizing NowCast, courtesy US EPA. The PM (particulate matter) NowCast is a weighted average of hourly air monitoring data used by the United States Environmental Protection Agency (USEPA) for real-time reporting of the Air Quality Index (AQI) for PM (PM 10 - particles less than 10 micrometers ...

  6. Air pollution measurement - Wikipedia

    en.wikipedia.org/wiki/Air_pollution_measurement

    Air pollution measurement is the process of collecting and measuring the components of air pollution, notably gases and particulates. The earliest devices used to measure pollution include rain gauges (in studies of acid rain ), Ringelmann charts for measuring smoke , and simple soot and dust collectors known as deposit gauges . [ 1 ]

  7. Air Quality Health Index (Canada) - Wikipedia

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

    The national AQHI is based on three-hour average concentrations of ground-level ozone (O 3), nitrogen dioxide (NO 2), and fine particulate matter (PM2.5). O 3 and NO 2 are measured in parts per billion (ppb) while PM2.5 is measured in micrograms per cubic metre (μg/m 3).

  8. Air pollution in Canada - Wikipedia

    en.wikipedia.org/wiki/Air_pollution_in_Canada

    CWS for PM2.5 = 30 μg/m 3 (24-hour averaging time, by year 2010, based on 98th percentile ambient measurement annually, averaged over 3 consecutive years). CWS for ozone = 65 ppb (8-hour averaging time, by year 2010, achievement is based on the 4th highest measurement annually, averaged over 3 consecutive years).

  9. Air pollution - Wikipedia

    en.wikipedia.org/wiki/Air_pollution

    The measurement is based on the observed relationship of nitrogen dioxide (NO 2), ground-level ozone (O 3) and particulates (PM 2.5) with mortality, from an analysis of several Canadian cities. Significantly, all three of these pollutants can pose health risks, even at low levels of exposure, especially among those with pre-existing health ...