Abstract
Diesel engine emissions are rich in PAHs and NPAHs, and vehicular emissions are a major source of PAHs and NPAHs in urban air. Specific NPAHs, including 1-nitropyrene, are enriched in diesel exhaust relative to other sources and have been used as source-specific tracers for diesel exhaust. However, changes in diesel engines and emission control technology driven by air quality regulations has led to substantial reductions in PAH and NPAH emissions from modern diesel engines and changes in the PAH/NPAH composition of these emissions. This chapter examines the contribution of diesel engine emissions to ambient PAH and NPAH concentrations and personal exposures and the effect of changing engine and exhaust treatment technologies on the PAHs and NPAHs emitted from diesel engines.
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