[Trends in Vehicle Emissions in Sichuan Province, 2010-2017]

Vehicle pollution in Sichuan Province is becoming increasingly serious. Here, based on specific inventory calculation methods and multi-caliber activity level data, this study calculated vehicle exhaust emissions from 2010 to 2017 in Sichuan Province. The results show that the average growth rate of vehicle ownership in Sichuan is higher than the national trend. In 2017, vehicle emissions of CO, NO, SO₂, NH₃, HC, PM_2.5, PM₁₀, BC, and OC were 706.9, 275.3, 0.3, 5.7, 164.8, 8.1, 8.9, 4.1, and 1.4 kt, respectively. Except for NH₃, showed a downward trend, peaking in 2014-2016. Diesel vehicle ownership showed a strong correlation with the emission of NO. Based on these observations, stricter vehicle emission standards offer the greatest potential for emissions reductions, with early implementation offering the greatest reduction potential. The improvement of fuel quality will also have more than a 6% emission reduction effect on pollutant emission each year. HC and NO emissions reductions will be an important control on vehicle pollution in Sichuan Province in the future.