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

Table 1

Statistical description of meteorological factors; mean and standard deviation (SD) values in 2019 and 2020 over Greater Bangkok.

	Before Lockdown 2019		Before Lockdown 2020
	Mean	SD	Mean	SD
TI	3.66	1.79	3.79	0.40
Fire (counts/day)	389.77	338.04	492.06	303.68
SP (mbar)	1011.86	2.25	1012.11	1.90
BLH (m)	511.71	428.72	295.21	160.70
TP (mm)	0.03	0.18	0.00	0.01
WS (m/s)	13.75	11.52	16.81	11.30
RH (%)	72.72	16.44	82.84	10.14
T2M (°C)	28.22	2.92	26.93	1.07
	Lockdown 2019		Lockdown 2020
TI	3.93	1.93	3.10	0.38
Fire (counts/day)	80.68	81.87	164.55	326.44
SP (mbar)	1007.66	2.33	1009.69	1.73
BLH (m)	615.80	371.17	393.45	130.12
TP (mm)	0.11	0.36	0.04	0.21
WS (m/s)	14.77	11.33	18.64	11.30
RH (%)	72.30	13.75	83.48	3.70
T2M (°C)	30.81	2.50	28.99	1.02
	After Lockdown 2019		After Lockdown 2020
TI	4.29	1.94	3.82	0.63
Fire (counts/day)	8.72	8.65	7.84	7.60
SP (mbar)	1006.72	1.54	1007.13	2.73
BLH (m)	584.75	350.74	301.21	125.16
TP (mm)	0.22	0.58	0.10	0.21
WS (m/s)	12.74	10.70	8.66	5.67
RH (%)	76.81	11.25	85.30	5.29
T2M (°C)	29.95	2.16	27.94	0.89