On-road vehicle emissions: US studies

Technical Report · Sat Jan 01 04:00:00 EST 1994

OSTI ID:7127183

Knapp, K T

Several recent events in mobile sources emissions measurements have caused a major reassessment of the amounts of volatile organic compounds (VOC) and carbon monoxide (CO) in the ambient air attributed to mobile sources. These include the comparison of real-world in-use vehicle emissions with those predicted by mobile emission factor models and the development of cross-road remote sensors for measuring emissions from in-use passing vehicles. The real-world measurements were generally higher than model predictions. A tunnel study in the Southern California Air Quality Study (SCAQS) found two-fold to seven-fold differences. Additional real-world studies, including the remote sensor, roadside I/M inspections and testing on the U.S. Environmental Protection Agency portable dynamometer have shown that 50% of the tailpipe emissions come from only 10% of the vehicles and 80% come from 20% of the vehicles. This paper describes the portable dynamometer study and several tunnel studies.

• Research Organization: Environmental Protection Agency, Research Triangle Park, NC (United States). Atmospheric Research and Exposure Assessment Lab.
• OSTI ID: 7127183
• Report Number(s): PB-94-209632/XAB; EPA--600/J-94/357
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION MONITORING
AROMATICS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COMPILED DATA
DATA
EXHAUST GASES
FLUIDS
GASEOUS WASTES
GASES
INFORMATION
MONITORING
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
ROAD TESTS
TESTING
VEHICLES
WASTES