Abstract：Five heavy duty diesel vehicles were selected for C-WTVC cycle test. Volatile organic compounds (VOCs), including 7 benzene series compounds and 14 aldehydes and ketones, were collected under the whole cycle. The results showed that toluene, benzene and styrene were the main pollutants of benzene series emissions from national six heavy duty diesel vehicles, accounting for 60% ~ 86% of the total; while formaldehyde, acetaldehyde and benzaldehyde were the main pollutants of aldehydes and ketones, accounting for 72% ~ 87% of the total. The specific emissions of benzene and styrene were 1.25 and 1.45 times of those in suburban driving mode respectively. The truck with 40% of urban area has the highest specific formaldehyde emission of 20.84mg/(kW×h). The emission of toluene and acetaldehyde is 1.65 and 2.1 times higher than that of other vehicles under suburban conditions. The average ozone potential of the vehicle is (249.53 ±10) mgO3/(kW×h).
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