Skip to main content

View full-text article in PMC

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

Table 3.

Pollutant matter and gases before and after lockdown in Delhi, 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	360.998	237.014	206.997	83.0983	246.746	100.014	185.979	7.085	245.963	8.089
PM₁₀	330.997	46.044	197.977	85.004	260.124	11.1415	218.968	50.1346	204.978	88.044
NO₂	120.932	6.015	78.976	28.057	85.9892	8.81	76.9671	6.04546	69.974	22.021
NH₃	12.994	0.015	12.999	3.006	11.999	4.005	9.999	2.004	13.994	1.002
SO₂	41.981	5.28	29.999	1.002	36.995	6.014	45.9934	6.012	33.792	7.001
CO	123.928	31.006	108.908	19.041	104.972	14.012	96.9816	5.006	103.948	12.008
O₃	42.999	30	65.987	8.008	28.849	5.013	73.97	3.016	42.968	4.019
AQI	361.998	42.59	364.89	45.32	355.489	52.13	312.35	40.89	319.89	42.39

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		06-May-2020		13-May-2020		20-May-2020		Overall variation
	High	Low	High	Low	High	Low	High	Low	High	Low	High	Low	High	Low	High	Low	High	Low	Net	%
PM_2.5	163.652	10.068	98.998	40.0045	90.998	29.025	118.98	35.002	107.789	32.001	110.23	38.8475	97.32	1.0078	96.89	1.198	95.98	2.02	− 103.198	− 61.3548
PM₁₀	142.985	53.037	90.999	45.02	118.999	68.0165	182.997	0.033	118.998	44.002	146.999	51.0328	123.989	33.008	112.59	32.09	109.89	33.08	− 65.5765	− 43.9105
NO₂	55.977	2.023	78.947	4.002	63.961	3.001	78.956	13.023	78.9491	6.002	78.948	10.001	41.999	9.001	42.58	8.02	41.39	7.59	− 15.6914	− 31.147
NH₃	11.39	3.001	9.993	2.001	5.999	2.014	10.99	3	10.94	0.0014	8.98	1.001	7.89	4.009	5.89	1.01	5.69	1.012	− 1.9344	− 26.8603
SO₂	40.73	9.001	29.98	1.003	24.98	4.00218	28.98	7.0004	21.999	1.008	20.89	1.009	19.89	9.0013	19.01	2.01	20.12	1.02	− 6.87172	− 32.1005
CO	100.23	2	74.813	7.026	75.89	9.053	76.89	20	77.78	16.007	75.89	16.9307	76.89	25.759	76.23	14.25	75.89	13.24	− 15.605	− 25.1771
O₃	46.996	5.019	55.958	5.023	73.944	5.031	157.985	5.0534	52.999	6.04	168.985	17.0367	66.9553	14.029	66.89	12.39	65.98	12.98	16.14457	52.9627
AQI	218.59	21.89	210.58	22.89	201.89	22.69	200.79	21.69	189.89	22.89	169.87	18.98	152.39	18.79	132.89	18.29	112.59	18.01	− 95.1493	− 49.0982

HHS Vulnerability Disclosure