L51431 Prediction of NO to NO2 Oxidation Downwind of Reciprocating Engine Natural Gas Compressor Stations

This study was performed to develop a predictive equation for use as a chemical component of dispersion models used for estimating the ground level concentration of NO2 downwind of natural gas compressor stations. A dispersion model is used to estimate downwind NOx concentrations, while the chemical submodel presented in the report is used to predict downwind NO2/NOx ratios. The chemical component of the model takes into account four sources of NO2 in the compressor station exhaust plume:1) Combustion generated NO2;2) NO2 produced by thermal conversion;3) NO2 generated by reaction of NO in the exhaust with O3 in the ambient air; and4) NO2 in the ambient air.