Sbai Salah Eddine, Mejjad Nezha, Norelyaqine Abderrahim, Bentayeb Farida
Department of physics, Laboratoires de physique des hauts Energies Modélisation et Simulation, Mohammed V University in Rabat, Rabat, Morocco.
Department of Geology, Faculty of Sciences, Ben M'Sik Hassan II University, Casablanca, Morocco.
Air Qual Atmos Health. 2021;14(5):617-628. doi: 10.1007/s11869-020-00965-w. Epub 2021 Jan 19.
Under the rapid spread of coronavirus diseases (COVID-19) worldwide, a complete lockdown was imposed in France from March 17th to May 11th, 2020 to limit the virus spread. This lockdown affected significantly the atmospheric pollution levels due to the restrictions of human activities. In the present study, we investigate the evolution of air quality in the Auvergne-Rhône-Alpes region, focusing on nine atmospheric pollutants (NO, NO, PM, PM, O, VOC, CO, SO, and isoprene). In Lyon, center of the region, the results indicated that NO, NO, and CO levels were reduced by 67%, 78%, and 62%, respectively, resulting in a decrease in road traffic by 80%. However, O, PM, and PM were increased by 105%, 23%, and 53%, respectively, during the lockdown. The increase in ozone is explained by the dropping in NO and other gases linked to human activity, which consume ozone. Thus, the increase of solar radiation, sunshine, temperature, and humidity promoted the O formation during the lockdown. Besides, rising temperature enhances the BVOC emissions such as isoprene. In addition, volatile organic component (VOC) and SO remain almost stable and oxidation of these species leads to the formation of ozone and organic aerosol, which also explains the increase in PM during the lockdown. This study shows the contribution of atmospheric photochemistry to air pollution.
The online version contains supplementary material available at 10.1007/s11869-020-00965-w.
在新冠病毒疾病（COVID-19）在全球迅速传播的情况下，法国于2020年3月17日至5月11日实施了全面封锁，以限制病毒传播。由于人类活动受到限制，此次封锁对大气污染水平产生了重大影响。在本研究中，我们调查了奥弗涅-罗讷-阿尔卑斯地区空气质量的变化，重点关注九种大气污染物（一氧化氮、二氧化氮、细颗粒物、可吸入颗粒物、臭氧、挥发性有机化合物、一氧化碳、二氧化硫和异戊二烯）。在该地区的中心城市里昂，结果表明，一氧化氮、二氧化氮和一氧化碳水平分别降低了67%、78%和62%，道路交通量减少了80%。然而，在封锁期间，臭氧、细颗粒物和可吸入颗粒物分别增加了105%、23%和53%。臭氧增加的原因是与人类活动相关的一氧化氮和其他消耗臭氧的气体减少。因此，太阳辐射、日照、温度和湿度的增加促进了封锁期间臭氧的形成。此外，温度升高会增加异戊二烯等生物源挥发性有机化合物的排放。此外，挥发性有机化合物和二氧化硫几乎保持稳定，这些物质的氧化导致臭氧和有机气溶胶的形成，这也解释了封锁期间可吸入颗粒物增加的原因。本研究显示了大气光化学对空气污染的影响。
网络版包含可在10.1007/s11869-020-00965-w获取的补充材料。
