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. 2020 Oct 22;23(6):9581–9608. doi: 10.1007/s10668-020-01034-z

Table 2.

Pollutant matter and gases before and after lockdown in India, 2020

Types of pollutants	Before lockdown
	17-Feb-2020		24-Feb-2020		02-Mar-2020		09-Mar-2020		16-Mar-2020
	High	Low	High	Low	High	Low	High	Low	High	Low
PM_2.5	362.811	45.004	250.869	44.89	281.917	37.285	209.849	21.002	185.852	32.064
PM₁₀	281.562	0.02	247.435	0.017	253.908	0.004	281.057	0.012	218.757	0.013
NO₂	114.556	3.151	122.967	6.091	85.977	5.078	99.252	0.087	75.98	0.074
NH₃	15.272	0.009	13.001	0.007	11.95	0.002	11.253	0.005	15.745	0.006
SO₂	66.946	1.586	52.958	0.62	82.917	0.008	45.954	0.124	82.889	6.003
CO	106.885	16.043	127.022	0.001	100.888	0.131	99.856	0.001	106.526	0.001
O₃	82.752	7.133	75.695	0.01	57.94	4.068	104.955	4.004	180.57	1.007
AQI	362.812	52.004	257.106	48.376	281.918	60.753	210.122	30.002	185.956	46.002

Types of pollutants	After lockdown																		Overall variation
	24-Mar-2020		30-Mar-2020		08-Apr-2020		14-Apr-2020		21-Apr-2020		29-Apr-2020		6-May-2020		13-May-2020		20-May-2020		Net	%
	High	Low	High	Low	High	Low	High	Low	High	Low	High	Low	High	Low	High	Low	High	Low	Net	%
PM_2.5	163.655	31.001	117.316	0.085	154.839	0.022	289.776	0.029	129.258	0.055	66.972	0.029	62.789	0.027	60.89	0.025	59.798	0.024	− 84.0104	− 57.09
PM₁₀	190.831	0.011	185.95	0.013	161.907	0.011	161.907	0.011	119.696	0.008	96.943	0.008	91.69	0.005	89.89	0.002	88.79	0.002	− 62.2966	− 48.5635
NO₂	57.729	0.052	60.903	0.056	76.627	0.008	70.983	0.087	64.506	0.008	42.726	0.026	40.521	0.021	38.789	0.002	36.988	0.002	− 24.0972	− 46.9536
NH₃	12.168	0.006	12.764	0.005	10.159	0.006	9.968	0.005	13.985	0.003	7.995	0.004	6.889	0.002	5.01	0.004	5.02	0.005	− 2.05844	− 30.6088
SO₂	65.94	0.023	36.935	0.03	52.605	0.025	45.482	0.027	43.908	0.003	44.891	0.003	42.907	0.002	41.89	0.005	40.79	0.005	− 10.9188	− 32.1136
CO	135.985	0.069	113.814	0.051	105.86	0.001	94.971	0.051	80.917	0.001	67.923	0.027	60.789	0.025	57.937	0.002	55.789	0.003	− 12.7235	− 22.8283
O₃	78.993	5.064	88.126	6.253	91.789	0.029	141.282	0.045	145.89	0.058	151.789	0.071	152.369	0.659	153.789	0.5	155.89	0.002	32.91671	63.52934
AQI	163.885	42.001	190.852	34.058	218.76	20.006	289.997	45.002	129.509	18.005	99.895	13.051	92.889	12.01	90.79	13.01	90.89	13.05	− 65.8573	− 42.9024

Source: National Air quality Index portal, Central Pollution Control Board, Govt. of India, 2020

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