COVID-19's impact on the atmospheric environment in the Southeast Asia region

Abstract

Impact of lockdown due to COVID-19 on aerosols and pollutants over Southeast Asia • Reduction in Himawari-8 AOD at urban areas is not affected by seasonal biomass burning • Large reductions (~27%-34%) of tropospheric NO 2 over urban agglomerations • Reductions in PM 10 , PM 2.5 , NO 2 , SO 2 , and CO are 26-31%, 23-32%, 63-64%, 9-20%, and 25-31%, respectively, in Malaysia (urban)

Separating the impact of gradual lockdown measures on air pollutants from seasonal variability

“…Myllyvirta and Thieriot (2020) found population-weighted average reductions of 30% for NO 2 and 1% for PM 10 in Austria. Our results are also in line with the observed effect of lockdown measures on air pollution in other parts of the world, as estimated by Petetin et al (2020) , Baldasano (2020) and Kanniah et al (2020) , among others, but different environments and lockdown measures do not permit a quantitative comparison of the reduction effect.…”

“… Bauwens et al (2020) show that tropospheric NO 2 levels fell by 40% over Chinese cities and by 20–38% in Europe and North America. Kanniah et al (2020) found a drop of around 30% over urban areas in Malaysia. The effect was even stronger for near-surface levels of NO 2 .…”

“…The effect was even stronger for near-surface levels of NO 2 . Lee et al (2020) found reductions of 42% in urban areas in the UK, Baldasano (2020) found reductions of 50–62% in Spain, Kanniah et al (2020) found reductions of 63–64% in Malaysia. In contrast, the reduction of particulate matter PM 10 was less pronounced and amounted to 26–31%.…”

“…In contrast, the reduction of particulate matter PM 10 was less pronounced and amounted to 26–31%. ( Kanniah et al, 2020 ).…”

Spread of COVID-19, Meteorological Conditions and Air Quality in the City of Buenos Aires, Argentina: Two Facets Observed during Its Pandemic Lockdown

“…During the COVID-19 pandemic lockdown, several studies around the world have studied its impact on air quality. Ghahremanloo et al [51] reported NO 2 reductions of up to 83% in East Asia, while in Southeast Asia, region reductions were observed in PM 10 (26-31%), PM 2.5 (23-32%), NO 2 (63-64%), SO 2 (9-20%), and CO (25-31%), in urban areas from Malaysia [52]. In India, AOD reductions of up to 50% were perceived in New Delhi [5].…”