ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

Process-based diagnostics of extreme pollution trail using numerical modelling during fatal second COVID-19 wave in the Indian capital

Beig, G and Jayachandran, KS and George, MP and Rathod, A and Sobhana, SB and Sahu, SK and Shinde, R and Jindal, V (2022) Process-based diagnostics of extreme pollution trail using numerical modelling during fatal second COVID-19 wave in the Indian capital. In: Chemosphere, 298 .

che_298_2022.pdf - Published Version

Download (8MB) | Preview
Official URL: https://doi.org/10.1016/j.chemosphere.2022.134271


The world's worst outbreak, the second COVID-19 wave, not only unleashed unprecedented devastation of human life, but also made an impact of lockdown in the Indian capital, New Delhi, in particulate matter (PM: PM2.5 and PM10) virtually ineffective during April to May 2021. The air quality remained not only unabated but also was marred by some unusual extreme pollution events. SAFAR-framework model simulations with different sensitivity experiments were conducted using the newly developed lockdown emission inventory to understand various processes responsible for these anomalies in PM. Model results well captured the magnitude and variations of the observed PM before and after the lockdown but significantly underestimated their levels in the initial period of lockdown followed by the first high pollution event when the mortality counts were at their peak (�400 deaths/day). It is believed that an unaccounted emission source was playing a leading role after balancing off the impact of curtailed lockdown emissions. The model suggests that the unprecedented surge in PM10 (690 μg/m3) on May 23, 2021, though Delhi was still under lockdown, was associated with large-scale dust transport originating from the north west part of India combined with the thunderstorm. The rainfall and local dust lifting played decisive roles in other unusual events. Obtained results and the proposed interpretation are likely to enhance our understanding and envisaged to help policymakers to frame suitable strategies in such kinds of emergencies in the future. © 2022 Elsevier Ltd

Item Type: Journal Article
Publication: Chemosphere
Publisher: Elsevier Ltd
Additional Information: The copyright for this article belongs to authors
Keywords: Air quality; Dust, COVID-19; Emission; Human lives; Lockdown; Particulate Matter; PM 10; PM 2.5; Process-based; SAFAR; WRF/Chem, Particles (particulate matter)
Department/Centre: Division of Information Sciences (Doesn't exist now) > National Centre for Science Information (Merged with JRD Library in May 2012)
Date Deposited: 12 May 2022 11:06
Last Modified: 12 May 2022 11:06
URI: https://eprints.iisc.ac.in/id/eprint/71737

Actions (login required)

View Item View Item