Abstract
Nonmethane hydrocarbons (NMHC) are not measured routinely at most ambient monitoring stations. Yet this type of information is required to evaluate existing control strategies aimed at achieving the National Ambient Air Quality Standard for O 3. This paper summarizes data from ambient air monitoring programs in seven urban centers (Houston, Philadelphia, Baltimore, Washington, D.C., Newark, Boston, Milwaukee,) and six rural areas in California, Wisconsin, Texas, Illinois, Maine and Florida. Gas Chromatographie analysis was used to identify individual C 2-C 10 HCs in more than 990 ambient air samples. Measurements in urban and rural areas are compared based on total and individual HC concentrations.
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