Emission inventories of air pollutants are important inputs for air quality models.This study compared two emission inventories for Jiangsu province,referred to as YRD emission inventory and JS emission inventory,compiled by Shanghai Academy of Environmental Sciences and Jiangsu Academy of Environmental Sciences,respectively.The impacts of emission inputs on simulated PM_2.5 and O₃ in the Yangtze River Delta (YRD) in January,April,July,and October of 2017 were assessed with the community multiscale air quality (CMAQ) model.The emission estimates of various pollutants (except SO₂) by JS emission inventory are lower than those by YRD emission inventory.Both the emission inventories can reproduce observations of SO₂,NO_x,O₃,and PM_2.5 with CMAQ.While the simulated PM_2.5 and O₃ with the two emission inputs are similar in spatial distributions and seasonal variations,PM_2.5 and O₃ with JS emission inventory are lower than those with YRD emission inventory mostly in the YRD region (except O₃ in January).This work shows that both of the emission inventories are good enough for air quality modeling,and to inform policy decision on control of fine particulate matter and photochemical smog pollution in Jiangsu province.