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nitrogen
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nitrogen oxides
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A Study of Emissions from 1966-1972 Light-Duty Vehicles in Washington, D.C
A Study of Emissions from Light Duty Vehicles in Six Cities
Study of Air Pollution Aspects of Various Roadway Configurations
Emission Control in Passenger Cars - a Contribution to Environmental Protection
Toxic Hazards Tests for Vehicles and Other Equipment
Prediction of the Effects of Transportation Controls on Air Quality in Major Metropolitan Areas