Abstract:The VOCs samples emitted from light-duty gasoline vehicles ranging from China II to China IV was collected by portableemission measurement system (PEMS). Alkanes, alkenes and aromatics in the exhaust were analyzed using GC-MS and GC-FID. Results demonstrated that the emission reductions of VOCs from light-duty gasoline vehicles had been achieved as the control technology become more rigorous, China II, China III and China IV vehicles were 49.62, 21.65 and 6.72mg/km, respectively. Aromatics were the dominant VOCs with weight percentages of 47.43%~60.52%. The ozone formation potentials and SOA formation potential for different emission standards were 24.64 ~ 234.14mg/km and 13.24 ~125.32mg/km. Driving speeds also influenced the VOCs emissions from the tested China III vehicles, the VOCs emission factors, ozone formation potential (OFP) and SOA formation potential from light-duty gasoline vehicles were dropped with the increase of the speed.
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