Vehicular emissions in the Yangtze River Delta, China, are a big source of air pollution. A study looked at emissions of ten pollutants over the past decade. Some pollutants increased first, then decreased, while others kept going up. CO2 and NH3 emissions grew a lot, while N2O and SO2 went up overall but decreased in some years. Different scenarios were tested to see which policies could reduce emissions. The ESV scenario was best for NOx, PM2.5, and CH4, the radical AER scenario could cut CO, NMVOCs, PM10, CO2, N2O, and NH3, and the RFS scenario was great for reducing SO2 emissions by a lot.