Latif Mohd Talib, Dominick Doreena, Hawari Nor Syamimi Sufiera Limi, Mohtar Anis Asma Ahmad, Othman Murnira
Department of Earth Sciences and Environment, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Malaysia.
Department of Environmental Health, Faculty of Public Health, Universitas Airlangga, 60115 Surabaya, Jawa Timur, Indonesia.
Sustain Cities Soc. 2021 Mar;66:102660. doi: 10.1016/j.scs.2020.102660. Epub 2020 Dec 15.
The COVID-19 pandemic forced many governments across the world to implement some form of lockdown to minimalize the spread of the virus. On 18th March 2020, the Malaysian government put into action an enforced movement control order (MCO) to reduce the numbers of infections. This study aims to investigate the concentrations of air pollutants during the MCO in the Klang Valley. The concentrations of air pollutants were recorded by the continuous air quality monitoring system (CAQMS) operated by the Department of Environment. The results showed that there were significant reductions ( < 0.05) of PM, PM, NO and CO during the MCO compared with the same periods in 2019 and 2018. The highest percentage of reduction during the MCO was recorded by NO with a percentage reduction of between -55 % and -72 %. O concentrations at several stations showed an increase due to the reductions of its precursors such as NO. Further investigation using diurnal patterns of air pollutant concentrations both before and during the MCO showed that NO and CO were both reduced significantly during the rush hours, indicating the reduction in motor vehicles on the roads as a consequence of the MCO influenced the levels of these pollutants.
新冠疫情迫使世界上许多国家的政府实施某种形式的封锁措施，以尽量减少病毒传播。2020年3月18日，马来西亚政府实施了强制行动管制令（MCO）以减少感染人数。本研究旨在调查巴生谷地区实施行动管制令期间的空气污染物浓度。空气污染物浓度由环境部运营的连续空气质量监测系统（CAQMS）记录。结果显示，与2019年和2018年同期相比，实施行动管制令期间，颗粒物（PM）、细颗粒物（PM）、氮氧化物（NO）和一氧化碳（CO）的浓度均有显著降低（<0.05）。行动管制令期间降幅最大的是氮氧化物，降幅在-55%至-72%之间。由于氮氧化物等前体污染物减少，几个监测站的臭氧（O）浓度有所上升。对行动管制令实施前后空气污染物浓度日变化模式的进一步调查显示，高峰时段氮氧化物和一氧化碳的浓度均显著降低，这表明行动管制令导致道路上机动车数量减少，进而影响了这些污染物的水平。
