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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. List of least-polluted cities by particulate matter concentration

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

    For instance, some places like Africa and South America lack air pollution reporting tools, so their pollution levels are probably not reflected in this list. Moreover, many cities from a certain country are featured in the list may only mean that they have large and wide air pollution monitoring networks, which may or may not be an indicator ...

  4. Air pollution in the United States - Wikipedia

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

    Looking down from the Hollywood Hills, with Griffith Observatory on the hill in the foreground, air pollution is visible in downtown Los Angeles on a late afternoon.. Air pollution is the introduction of chemicals, particulate matter, or biological materials into the atmosphere that cause harm or discomfort to humans or other living organisms, or damage ecosystems.

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

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

    When levels reach above 100, air quality is considered unhealthy for sensitive groups, and the Mid-Ohio Regional Planning Commission issues an air quality alert.

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

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

    To help keep the air quality at lower levels, try to carpool, bike or walk if possible and refuel vehicles after 8 p.m. Try to avoid idling vehicles and use gas-powered lawn equipment, including ...

  7. 131 million in U.S. live in areas with unhealthy pollution ...

    www.aol.com/news/131-million-u-live-areas...

    Nearly 40% of people in the U.S. are living in areas with unhealthy levels of air pollution and the country is backsliding on clean air progress as the effects of climate change intensify ...

  8. 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.

  9. Whose smog is that? Supreme Court hears from Ohio in cross ...

    www.aol.com/whose-smog-supreme-court-hears...

    Three states -- Ohio, Indiana and West Virginia -- want to stop enforcement of cross-state air pollution rules while they fight them in a lower court.

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