Smog, hydrocarbon influence

Benefits depend upon location. There is reason to beheve that the ratio of hydrocarbon emissions to NO has an influence on the degree of benefit from methanol substitution in reducing the formation of photochemical smog (69). Additionally, continued testing on methanol vehicles, particularly on vehicles which have accumulated a considerable number of miles, may show that some of the assumptions made in the Carnegie Mellon assessment are not vahd. Air quaUty benefits of methanol also depend on good catalyst performance, especially in controlling formaldehyde, over the entire useful life of the vehicle. 

Photochemical smog, an infamous example being Los Angeles smog, is a combination of unburned hydrocarbons, carbon monoxide, and nitrogen oxides from automobile exhaust that reacts under the influence of sunlight to produce a variety... 

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