Methane Emissions from Vehicles

Methane (CH4) is an important greenhouse gas emitted by vehicles. We report results of a laboratory study of methane emissions using a standard driving cycle for 30 different cars and trucks (1995−1999 model years) from four different manufacturers. We recommend the use of an average emission factor...

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Bibliographic Details
Published in:Environmental science & technology 2004-04, Vol.38 (7), p.2005-2010
Main Authors: Nam, E. K, Jensen, T. E, Wallington, T. J
Format: Article
Language:English
Subjects:
Air Pollutants - analysis
Applied sciences
Atmospheric pollution
Automobiles
Climate
Emissions
Exact sciences and technology
Greenhouse gases
Methane
Methane - analysis
Pollution
Pollution sources. Measurement results
Reference Values
Transports
Vehicle Emissions - analysis
Vehicles
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Summary:Methane (CH4) is an important greenhouse gas emitted by vehicles. We report results of a laboratory study of methane emissions using a standard driving cycle for 30 different cars and trucks (1995−1999 model years) from four different manufacturers. We recommend the use of an average emission factor for the U.S. on-road vehicle fleet of (g of CH4/g of CO2) = (15 ± 4) × 10-5 and estimate that the global vehicle fleet emits 0.45 ± 0.12 Tg of CH4 yr-1 (0.34 ± 0.09 Tg of C yr-1), which represents
ISSN:0013-936X
1520-5851
DOI:10.1021/es034837g