Kazopoulo, M., El Fadel, M. and Kaysi, I. (2005) Emission standards development for an inspection/maintenance program. Journal of Environmental Engineering, 131 (9), 1330-1339. (doi:10.1061/(ASCE)0733-9372(2005)131:9(1330)).
Abstract
This paper presents the results of vehicle exhaust measurements that were used to establish emission standards for an inspection/maintenance (I/M) program. For this purpose, a total number of 100 private autos distributed across model years ranging between 1972 and 2002 were tested under idling conditions. The monitored indicators included air to fuel ratio (%), CO (%), CO2 (%), HC (parts per million, ppm), NOx (ppm), and O2 (%). Private autos with model years greater than 1994 were found to be compliant with international standards and are relatively well maintained. Emissions from older models increased significantly with a lack of engine maintenance. The paper concludes with criteria for proposing I/M emission standards based on exhaust measurements taking country-specific socioeconomic characteristics into consideration.
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