by the United States government, United States Code — Title 42, Chapter 85…
“ Hydrocarbons, carbon monoxide, petrochemical oxidants, and nitrogen oxides In the case of the pollutants hydrocarbons, carbon monoxide, photochemical oxidants, and nitrogen oxides, the Administrator shall conduct a study and not later than two years after August 7, 1977, promulgate regulations to prevent the significant deterioration of air quality which would result from the emissions of such pollutants. ”
