'Condensation h2o' presentation slideshows

Urban Air Pollution

Urban Air Pollution. Smog- Complex mixture of hydrocarbon, nitrogen oxides, ozone, and submicrometer particles. A useful reference point for Smog [O 3 ]>0.15 ppm for one hour. O 3 is the most difficult pollutant to control. Current standards. http://www.epa.gov/airtrends/ozone.html. O. 3.

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