Non-Methane Hydrocarbon Air Quality Measurements

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Abstract
It is important in the implementation of the air quality standard for ozone/oxidants and non-methane hydrocarbons to develop quantitative relationships between these pollutants in air quality regions. Analyses for ambient air non-methane hydrocarbon give a direct measure of the progress in control of hydrocarbon emissions and in the reduction of oxidant/ozone concentration levels. Total hydrocarbon concentrations are much more available than non-hydrocarbon levels. An empirical relationship between total hydrocarbons and non-methane hydrocarbons has been obtained from measurements at both west and east coast sites in the U. S. The comparability of measurements from flame ionization analyzers and gas chromatography has been demonstrated. Either analytical technique can be applied to samples collected at monitoring sites to provide the 6-9 A.M. non-methane hydrocarbon aerometric results specified in the air quality standards.

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