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Exhaust Emission Levels of In-Service Vehicles - Comparison of 1970 and 1971 Surveys
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English
Abstract
The results of a nationwide automobile exhaust emission survey conducted in 1971 are presented and compared to data obtained from a 1970 survey. Average hydrocarbon and carbon monoxide emissions are given for engine speeds of idle and 2500 rpm.
Vehicle distribution curves for hydrocarbon and carbon monoxide emissions are shown for the 1971 data for selected year groups based on emission control devices. Comparison of the distribution curves obtained from the 1971 and 1970 data show that “deterioration” (increased emissions) occurred at both idle and 2500 rpm in the one year period. The effects of carburetor adjustments on idle emissions are compared for the 1971 and 1970 data.
Authors
Citation
Voelz, F., Coleman, E., Segal, J., and Gower, B., "Exhaust Emission Levels of In-Service Vehicles - Comparison of 1970 and 1971 Surveys," SAE Technical Paper 720498, 1972, https://doi.org/10.4271/720498.Also In
References
- Voelz Onyon Oust Rusnack Segal Gower “Survey of Nationwide Automotive Exhaust Emissions and PCV System Conditions - Summer 1970.” Paper 710834 presented at the Truck, Powerplant, and Fuels and Lubricants Meeting St. Louis, Mo. October 1971
- Cline Tinkham “Realistic Vehicle Emissions Inspection System.” J. Air Pollution Assn. 19 1969 230
- Chew M. F. “Auto Smog Inspection at Idle Only.” SAE Transactions 78 1969 paper 690505
- Vehicle Registration Information from Data Compiled R. L. Polk and Co. Detroit