Table 1.

Statistics of measured O₃, NO_x, CO and BC during March–April 2020 at Bhubaneswar (PL, pre-lockdown; L1, lockdown 1.0; L2, lockdown 2.0; L3, lockdown 3.0; L4, lockdown 4.0; UL, unlock 1.0)

CO (ppbv)
Phases (date 2020)	Minimum	Maximum	Mean	SD
PL (01/3–21/3)	367.08	660.85	535.41	84.74
L1 (22/3–14/4)	276.06	837.67	526.95	133.19
L2 (15/4–03/5)	219.07	620.42	445.44	101.47
L3(04/5–17/5)	198.13	673.96	493.41	126.08
L4 (18/5–31/5)	178.54	527.71	368.24	131.44
UL (01/6–30/6)	93.54	395.00	208.09	64.41
Weekday during UL	93.54	395.00	219.29	66.62
Weekend during UL_shutdown	99.77	252.50	177.29	66.62
NOx (ppbv)
	Minimum	Maximum	Mean	SD
PL (01/3–21/3)	8.63	25.49	16.00	5.08
L1 (22/3–14/4)	2.57	10.86	5.13	1.96
L2 (15/4–03/5)	2.72	7.38	4.58	1.33
L3 (04/5–17/5)	3.33	9.31	5.61	1.65
L4 (18/5–31/5)	1.54	15.55	5.97	4.56
UL (01/6–30/6)	0.97	7.39	3.44	1.72
Weekday during UL	1.51	7.39	3.88	1.55
Weekend during UL_shutdown	0.96	5.35	2.23	1.55
BC (μg m−3)
	Minimum	Maximum	Mean	SD
PL (01/3–21/3)	0.84	2.83	1.79	0.51
L1 (22/3–14/4)	0.86	2.09	1.31	0.33
L2 (15/4–03/5)	0.45	1.17	0.75	0.19
L3 (04/5–17/5)	0.56	1.36	0.85	0.24
L4 (18/5–31/5)	0.68	2.06	0.93	0.37
UL (01/6–30/6)	0.62	2.04	1.11	0.33
Weekday during UL	0.64	2.04	1.16	0.34
Weekend during UL_shutdown	0.62	1.48	1.01	0.34
O3 (ppbv)
	Minimum	Maximum	Mean	SD
PL (01/3–21/3)	20.86	32.76	27.45	3.53
L1 (22/3–14/4)	21.06	40.15	28.34	5.46
L2 (15/4–03/5)	17.70	24.44	21.10	2.11
L3 (04/5–17/5)	19.02	30.58	21.88	2.86
L4 (18/5–31/5)	16.95	28.34	22.83	3.84
UL (01/6–30/6)	17.23	34.06	22.15	3.91
Weekday during UL	17.23	34.05	21.70	3.84
Weekend during UL_shutdown	18.01	29.42	23.39	3.84