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Major Chemical Pollutants in Photochemical Smog: Sources and Environmental Effects Toxic Chemical Sources Environmental Effects Additional Notes Nitrogen Oxides (NO and NO2) - combustion of oil, coal, gas in both automobiles and industry - bacterial action in soil - forest fires - volcanic action - lightning - decreased visibility due to yellowish color of NO2 - NO2 contributes to heart and lung problems - NO2 can suppress plantgrowth - decreased resistance to infection - may encourage the spread of cancer - all combustion processes account for only 5 % of NO2 in the atmosphere, most is formed from reactions involving NO -concentrations likely to rise in the future Volatile Organic Compounds (VOCs) - evaporation of solvents - evaporation of fuels - incomplete combustion of fossil fuels - naturally occurring compounds like terpenes from trees - eye irritation - respiratory irritation - some are carcinogenic - decreased visibility due to blue-brown haze - the effects of...

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