Investigation on the Impacts of COVID-19 Lockdown and Influencing Factors on Air Quality in Greater Bangkok, Thailand

Figure 2

Rolling 24-hour average of hourly air pollutant concentration variations of major air pollutants over 23 ground-based stations in Greater Bangkok for the years 2019 and 2020. Grey color highlights the Lockdown period from March 26, 2020, to May 31, 2020. (a) PM2.5. (b) PM10. (c) NO₂. (d) O₃. (e) SO₂. (f) CO.

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