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

Figure 4

Temporal variations of the traffic index (a), Fire spot count (b), surface pressure (c), air temperature at 2 meters (d), relative humidity (e), wind speed (f), boundary layer height (g), and total precipitation (h). Grey color highlights the Lockdown period from March 26, 2020, to May 31, 2020. Influence factors driving the improvements in air quality.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)