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  2. Dangerously hot temperatures, poor air quality continue in ...

    www.aol.com/dangerously-hot-temperatures-poor...

    An excessive heat warning remains in effect until 10 p.m. in northern Illinois, as the weather service warns of a heat index — what the temperature feels like when humidity is combined with air ...

  3. National Ambient Air Quality Standards - Wikipedia

    en.wikipedia.org/wiki/National_Ambient_Air...

    US counties that are designated "nonattainment" for the Clean Air Act's NAAQS, as of September 30, 2017. The U.S. National Ambient Air Quality Standards (NAAQS, pronounced / ˈ n æ k s / naks) are limits on atmospheric concentration of six pollutants that cause smog, acid rain, and other health hazards. [1]

  4. Chicago Heights, IL Weather - Hourly Forecasts and Local ...

    www.aol.com/weather/forecast/us/chicago-heights...

    Get the Chicago Heights, IL local weather forecast by the hour and the next 10 days. ... Fox Weather 8 hours ago New York City, Boston among 30 million under Winter Storm Watch as new weekend ...

  5. 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.

  6. 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 ...

  7. Chicago air quality unhealthy as Canadian wildfire emissions ...

    www.aol.com/chicago-air-quality-unhealthy...

    The air quality in Chicago has reached unhealthy levels as the city is affected by the smoke coming from the wildfires in Canada, where record-beating emissions are leading to the smoke travelling ...

  8. Air quality index - Wikipedia

    en.wikipedia.org/wiki/Air_quality_index

    This index pays particular attention to people who are sensitive to air pollution. It provides them with advice on how to protect their health during air quality levels associated with low, moderate, high and very high health risks. The AQHI provides a number from 1 to 10+ to indicate the level of health risk associated with local air quality ...

  9. Chicago, IL Weather - Hourly Forecasts and Local Weather ...

    www.aol.com/weather/forecast/us/chicago-12784304

    Get the Chicago, IL local weather forecast by the hour and the next 10 days. ... we currently have a 5 location limit. ... The Weather Channel 14 hours ago On Today's Date: Unusual February ...