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Key terms: smog air haze pollution ozone fires index smoke des fog levels coal danger ppm api new york standards nitrogen affected problem los angeles vocs air pollution forest blamed malaysian severe air quality industrial unhealthy singapore indonesia emissions beijing exhaust photochemical smog teesside sunlight particulate hazardous united states atmosphere sulfur dioxide mexico city environmental affected area tropospheric ozone southeast asian haze nitrogen dioxide air quality index Search external links cited by footnotes on Wikipedia page Smog: |
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