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. 2021 May 27;11:11119. doi: 10.1038/s41598-021-90617-5

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© The Author(s) 2021, corrected publication 2021

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Number concentration of sulphate particulates versus (a) concentration of SO₂; (b) concentration of NO₂; (c) concentration of NH₃ and (d) RH during the pollution accumulation period (PAP) and non-pollution accumulation period (NPAP, i.e. pre-pollution and pollution dissipation period) from February 18 to 24, 2020.