Changes of air pollutants emission from vehicles on national and provincial roads of Hebei during the COVID-19 epidemic in China

In order to investigate the changes of air pollutants emissions from vehicles on national and provincial roads in Hebei province during the COVID-19 epidemic in China, the emission inventory of on-road mobile sources was established based on the daily traffic flow monitoring data of national and provincial roads from Jan to Mar of 2019 and 2020, respectively The total traffic flow from Jan to Mar in 2020 decreased for 38 1% compared with that in 2019, while the emission intensity of CO, VOCs, NOx, PM2 5, PM10 decreased 31 3%, 32 7%, 19 1%, 20 2%, 20 0%, respectively The total traffic flow on ordinary roads kept decreasing tendency in the first quarter of 2020, while for the national and the provincial highway, this number increased for 5 6% and 37 2% in Mar , respectively During the Spring Festival travel rush of 2020, the total traffic flow of passenger cars and trucks was the 44 2% and 51 0% of that in the same period in 2019, and the emitted CO, VOCs, NOx, PM2 5, PM10 was 51 4%, 50 6%, 52 6%, 52 3%, 52 3% of that in last year, respectively Passenger and truck traffic flow began to recover gradually from Feb 14 in 2020, and at the end of Mar , the total traffic flow was 46 6% of that in last year, passenger cars and truck was 34 5% and 70 3% of that in last year, respectively © 2021, Science Press All right reserved