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  2. 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]

  3. Castle Rock, Colorado - Wikipedia

    en.wikipedia.org/wiki/Castle_Rock,_Colorado

    Castle Rock is a home-rule town that is the county seat and the most-populous municipality of Douglas County, Colorado, United States. [7] The town’s population was 73,158 at the 2020 census, [3] a 51.68% increase since the 2010 census. Castle Rock is the most populous Colorado town (rather than city) and the 14th-most populous Colorado ...

  4. National Register of Historic Places listings in Douglas ...

    en.wikipedia.org/wiki/National_Register_of...

    Castle Rock: 12: Evans Homestead Rural Historic Landscape: April 25, 2012 : Address Restricted: Franktown: 13: First National Bank of Douglas County: First National Bank of Douglas County: April 14, 1995 : 300 Wilcox St.

  5. Air pollution in the United States - Wikipedia

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

    Air pollution in Los Angeles has caused widespread concerns. In 2012, the Public Policy Institute of California (PPIC) Survey on Californians and the Environment showed that 45% of citizens in Los Angeles consider air pollution to be a "big problem", and 47% believe that the air quality of Los Angeles is worse than it was 10 years ago. [96]

  6. Air quality index - Wikipedia

    en.wikipedia.org/wiki/Air_quality_index

    The most commonly used air quality index in the UK is the Daily Air Quality Index recommended by the Committee on the Medical Effects of Air Pollutants (COMEAP). [39] This index has ten points, which are further grouped into four bands: low, moderate, high and very high. Each of the bands comes with advice for at-risk groups and the general ...

  7. Castle Rock (Colorado) - Wikipedia

    en.wikipedia.org/wiki/Castle_Rock_(Colorado)

    Castle Rock is a butte in the Colorado Piedmont region of the Great Plains. [1] [2] An area landmark, it is the namesake of the town of Castle Rock, Colorado. [3] The mesa’s caprock consists of rhyolite, rock which is strongly resistant to erosion. About 58 million years ago, a volcanic eruption took place that covered the area around Castle ...