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

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

    The January 2024 version of the WHO database contains results of ambient (outdoor) air pollution monitoring from almost 5,390 towns and cities in 63 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 ...

  3. Air pollution - Wikipedia

    en.wikipedia.org/wiki/Air_pollution

    Growing evidence that air pollution—even when experienced at very low levels—hurts human health, led the WHO to revise its guideline (from 10 μg/m 3 to 5 μg/m 3) for what it considers a safe level of exposure of particulate pollution, bringing most of the world—97.3 percent of the global population—into the unsafe zone.

  4. List of least-polluted cities by particulate matter concentration

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

    [1] [2] By default the least polluted cities which have fewest particulates in the air come first. Click on the arrows next to the table's headers to have the most polluted cities ranked first. Click on the arrows next to the table's headers to have the most polluted cities ranked first.

  5. What parts of central Ohio have lower air quality Tuesday as ...

    www.aol.com/parts-central-ohio-lower-air...

    Air quality map in central Ohio shows portions of central and south Ohio were experiencing reduced air quality Tuesday. ... The Fire and Smoke map shows many of the active fires in the area remain ...

  6. Why is Ohio's air quality bad today? Here's why the ... - AOL

    www.aol.com/why-ohios-air-quality-bad-153508217.html

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  7. Several central Ohio counties under air quality alert ... - AOL

    www.aol.com/air-quality-alert-issued-columbus...

    The Mid-Ohio Regional Planning Commission issued an air quality alert ... Some of the local parks also have splash pads that the city has opened. ... To help keep the air quality at lower levels ...

  8. Air pollution in the United States - Wikipedia

    en.wikipedia.org/wiki/Air_pollution_in_the...

    After a steady 23-year decline in US pollution levels through 2017, the American Lung Association's State of the Air 2022 report found a sharp uptick in pollution over the past five years. [ 96 ] According to the American Lung Association's State of the Air 2024 report, California retains its position of being the state with the most metro ...

  9. Ground-level ozone - Wikipedia

    en.wikipedia.org/wiki/Ground-level_ozone

    Ground-level ozone (O 3), also known as surface-level ozone and tropospheric ozone, is a trace gas in the troposphere (the lowest level of the Earth's atmosphere), with an average concentration of 20–30 parts per billion by volume (ppbv), with close to 100 ppbv in polluted areas.

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