Emissions Inspector Certification Flash Cards
the contamination of the atmosphere by the introduction of pollutants from human and natural sources air pollution Estimated that 20% of all US pollution comes from cars and trucks United States Environmental Protection Agency (EPA) Hydrocarbons (HCs), Carbon Monoxide (CO), Nitrogen Oxides (NOx). Other pollutants includes Sulfur Dioxide (SO2) and Particulate Matter. Major pollutants from vehicles Principal constituents of gasoline, diesal, and natural gas. Excessive amounts of this pollutant is mainly from incomplete combustion and rich fuel mixtures. Tends to stay consistent with the stoichiometric ratio. Hydrocarbons Forms with HC to create smog; mainly formed in vehicle engines during combustion of fuel at high temperatures. Primary cause of acid rain Nitrogen Oxides Too much or too little is bad and can cause improper combustion. Too little can be from rich air- fuel mixture, and dirty air filters. Too much can be caused by lean air-fuel mixture or engine misfires. Oxygen Not emitted directly into the air, but created at ground level by chemical reactions from NOx and HC. Also known as smog. Ozone(Smog) This matter is released into the air by combustion and can damage the lungs and cause health problems Particulates Shows how the ratio of each gas to the others changes in response to dif
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