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