Investigation on air pollution control strategy in Hangzhou for post-G20/pre-Asian-games period (2018–2020)

摘要

For the purpose of offering a detailed atmospheric pollution control strategy to the Hangzhou government to make the major atmospheric pollutants (SO2, NO2, PM2.5 and PM10) meet the environmental regulation aim required by the 13th Five Year Plan of Hangzhou, the WRF/CMAQ model is used to simulate the pollution level over Hangzhou. Observed data from five local environmental monitoring stations in the downtown Hangzhou are selected to evaluate the performance of simulation. The indicator factors confirm the accuracy of the WRF/CMAQ modeling system. Results show the local emission sources account for 15.8%, 68.6%, 48.3% and 59.2% of the overall SO2, NO2, PM2.5 and PM10 concentration in 2017, respectively. And the research on the separate local sectors indicates traffic donates 71.6% of local NO2 emission while industry contributes 73.8%, 53.2% and 56.7% of the total local emission of SO2, PM2.5 and PM10, respectively. The more severe pollution during the wintertime was mainly due to low wet deposition, low temperature, low wind speed, prevailing wind direction, the condition of local deciduous plants and urban heat island. If the local traffic and industry are cut down by 6% and 10%, respectively, the air pollution control targets on SO2, NO2, PM2.5 and PM10 in 2020 can be hit.