Table 3.

Yearly mean O₃ of different AQI monitoring stations.

O3
Sl. No	AQI station	Parameter	2018	2019	2020	2021
1	Kolkata	Maximum	171	98	106	163
		Minimum	19	4	40	6
2	Delhi	Maximum	189	172	157	176
		Minimum	34	31	24	26
3	Patna	Maximum	107	99	85	94
		Minimum	18	12	19	14
4	Chennai	Maximum	94	84	76	104
		Minimum	24	21	15	13
5	Mumbai	Maximum	165	142	124	143
		Minimum	15	24	10	24
6	Ahmedabad	Maximum	73	62	52	79
		Minimum	14	11	9	21
7	Bengaluru	Maximum	83	79	64	89
		Minimum	28	14	11	10
8	Lucknow	Maximum	129	118	104	127
		Minimum	24	17	9	16
9	Muzaffarnagar	Maximum	143	124	117	134
		Minimum	21	9	18	12
10	Guwahati	Maximum	76	49	37	59
		Minimum	15	13	11	15