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[B-2.8 Methane and Nitrous Oxide Emission Characteristics from Automobiles]

[Contact Person]

Tugio Abe
Director, Traffic Nuisance Division
Traffic Safety and Nuisance Research Institute
Ministry of Transport
6-38-1 Shinkawa, Mitaka, Tokyo 181 Japan
Phone +81-422-41-3217, Fax +81-422-41-3233

[Total Budget for FY1991-1994]

21,106,000 Yen (FY1994 5,656,000 Yen)

[Abstract]

　Exhaust gases discharged from automobiles that are increasing rapidly in number are noticed as one of the reasons for a resent increase in atmospheric methane and nitrous oxide concentration, which have been considered as greenhouse effect gas.
　In order to make an accurate estimation of methane and nitrous oxide contribution, measurement methods about them were studied and their discharged amount of various automobiles were evaluated under various driving conditions.
　On the basis of those measurement results with taking statistics such as the number of automobiles, the total annual mileage, and the total annual fuel consumption into consideration, we attempted several methods for evaluating the annual global emissions. As a result, passenger vehicles were playing an important role in greenhouse effect and their annual emissions that were based on the global number of automobiles and the global amounts of fuel consumption were methane; 477.263t/year and nitrous oxide; 313.472t/year, which was higher than what had been estimated.

[Key Words]

Greenhouse Effect Gas, Automotive Exhaust Gas, Methane, Nitrous Oxide, Continuous Measuring Method, Three Way Catalyst