Abstract：Evaporative emission tests were performed to obtain the actual emission factors within hot-soak and diurnal-loss stages of light-duty gasoline vehicles. Based on the MOVES model, the total evaporative emissions from light-duty gasoline vehicles in Beijing was estimated with vehicle preservation and activity data as input. Evaporative emission factors of China-Ⅴ and China-Ⅵ vehicles were 1.03 g/test and 0.37 g/test, respectively. The evaporative emissions from light-duty gasoline vehicles showed no evident deterioration trend with the increase of mileage. The total evaporative emissions of light-duty gasoline vehicles in Beijing were 8299.7 t, about 68.3% of the annual tailpipe THC emissions attributed to light-duty gasoline vehicles. A reduction of 13.7% in the total evaporative emissions from light-duty gasoline vehicles in Beijing is projected with China-Ⅵ vehicles replacing the in-service models certified to China-Ⅲ.
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