Impact of Lockdowns on Air Pollution: Case Studies of Two Periods in 2022 in Guangzhou, China

• Published in: Atmosphere Vol. 15; no. 9; p. 1144
• Main Authors: Zhao, Xinlei, Li, Xian-Xiang, Xin, Rui, Zhang, Yuejuan, Liu, Chun-Ho
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.09.2024
• Subjects: Air pollution; Air quality; Case studies; Coronaviruses; COVID-19; Disease prevention; Economic activity; Emission analysis; Emissions; Emissions control; Environmental aspects; GDP; Gross Domestic Product; Humidity; Impact analysis; Measurement; Nitrogen compounds; Nitrogen dioxide; Nitrogen oxide; Nitrogen oxides; Nitrogen oxides emissions; NOx; Organic compounds; Outdoor air quality; Ozone; Ozone formation; Pandemics; Particulate matter; Photochemicals; Photochemistry; Pollutants; Pollution control; Pollution studies; Population density; Quality standards; Satellite observation; Sensitivity analysis; Smog; Sulfur dioxide; Titration; urban-rural contrasts; Viral diseases; VOCs; Volatile organic compounds; China; Beijing China; Guangzhou China; Europe

The photochemical mechanisms of ozone (O3) formation are complex, and simply reducing nitrogen oxide (NOx) emissions is insufficient to reduce O3 concentrations. The lockdown due to the Coronavirus Disease 2019 (COVID-19) pandemic provided a rare opportunity to explore the mechanisms of O3 formation...