Review and reconciliation of on-road emission factors in the South Coast Air Basin. Final report

Technical Report · Tue Jan 01 04:00:00 EST 1991

OSTI ID:7175316

Gertler, A W; Pierson, W R; Watson, J G

The Van Nuys Tunnel experiment conducted in 1987 by Ingalls et al to verify automotive emission inventories as part of the Southern California Air Quality Study, gave higher CO and HC emission-rate values than expected on the basis of automotive-emission models - by factors of approximately 3 and 4, respectively. The CO/NOx and HC/NOx emission-rate ratios moreover were higher than expected - by similar factors (NOx emission rates were about as expected). The purpose of the present paper is to review the literature on dynamometer and on-road (in tunnels and along roadways) testing of in-use vehicles, and on urban-air CO/HC/NOx concentration ratios, to see whether the Van Nuys Tunnel results are reasonable in terms of previous experience. The conclusions are that (1) on-road CO and HC emissions higher than expected have been reported before, (2) on-road CO and HC emissions consistent with the Van Nuys Tunnel results have been reported before, and (3) on-road CO/NOx and HC/NOx emission-rate ratios higher than expected have been reported before.

• Research Organization: Nevada Univ., Reno, NV (United States). Desert Research Inst.
• OSTI ID: 7175316
• Report Number(s): PB-92-203736/XAB; DRI--8401.1F1
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION
AIR POLLUTION MONITORING
CALIFORNIA
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
DEVELOPED COUNTRIES
DYNAMOMETERS
ECOLOGICAL CONCENTRATION
EMISSION
EXHAUST GASES
FLUIDS
GASEOUS WASTES
GASES
HYDROCARBONS
MEASURING INSTRUMENTS
MONITORING
NITROGEN COMPOUNDS
NITROGEN OXIDES
NORTH AMERICA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION
TUNNELS
UNDERGROUND FACILITIES
URBAN AREAS
USA
VEHICLES
WASTES