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. 2020 Aug 10;10:13442. doi: 10.1038/s41598-020-70179-8

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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High resolution monitoring (averaged over 2 min interval) of PM_2.5 shown since morning to evening. On 4 April 2020 from 0500 to 0700 IST haze prevailed. After sunrise, around 0710 IST, within 20 min (0730 IST onwards) further a steep and step increase of about 100–300 µg m⁻³ in PM_2.5 took place, which lasted for about an hour. Steep and step wise increase was a common feature for several days. As soon as solar radiation increased above 300 W m⁻², and wind speed increased around 1000 IST, sudden decline in PM_2.5 observed up to 20 µg m⁻³.