Table 4.

Yearly mean CO of different AQI monitoring stations.

CO
Sl. no	AQI station	Parameter	2018	2019	2020	2021
1	Kolkata	Maximum	81	27	30	74
		Minimum	24	6	9	26
2	Delhi	Maximum	89	72	62	91
		Minimum	21	13	10	24
3	Patna	Maximum	48	39	24	52
		Minimum	9	11	9	13
4	Chennai	Maximum	53	47	31	57
		Minimum	10	9	18	15
5	Mumbai	Maximum	75	64	42	81
		Minimum	26	24	13	21
6	Ahmedabad	Maximum	37	31	29	46
		Minimum	10	16	12	14
7	Bengaluru	Maximum	52	47	39	59
		Minimum	14	12	10	19
8	Lucknow	Maximum	87	72	59	97
		Minimum	23	12	9	20
9	Muzaffarnagar	Maximum	86	74	42	83
		Minimum	15	10	16	15
10	Guwahati	Maximum	31	29	24	37
		Minimum	17	14	5	12