Cities With the Highest Ozone Right Now

Cixi has the highest ground-level ozone concentration in our major-city sample right now, at about 297.0 µg/m³.

Updated hourly. Last updated Aug 1, 2026, 6:05:08 AM UTC.

Cities with at least 200,000 residents; 100 cities shown.

Top Cities Ranked by Ozone (O3)

#	City	Country	US AQI	PM2.5	Ozone (O3)
🥇	Cixi	China	139	51.1 µg/m³	297.0 µg/m³
=2	Nantong	China	108	38.2 µg/m³	290.0 µg/m³
=2	Zhangjiagang	China	108	38.2 µg/m³	290.0 µg/m³
🥉	Changshu	China	106	37.4 µg/m³	289.0 µg/m³
4	Suzhou	China	112	39.8 µg/m³	275.0 µg/m³
5	Kunshan	China	101	35.6 µg/m³	272.0 µg/m³
6	Jiangyin	China	86	27.9 µg/m³	257.0 µg/m³
=7	Tokyo	Japan	118	42.6 µg/m³	255.0 µg/m³
=7	Yokohama	Japan	118	42.6 µg/m³	255.0 µg/m³
=7	Kawasaki	Japan	118	42.6 µg/m³	255.0 µg/m³
8	Wuxi	China	86	28.0 µg/m³	247.0 µg/m³
9	Wenzhou	China	73	21.0 µg/m³	235.0 µg/m³
10	Tangshan	China	90	29.9 µg/m³	233.0 µg/m³
11	Beijing	China	127	45.9 µg/m³	227.0 µg/m³
12	Ningbo	China	92	31.0 µg/m³	224.0 µg/m³
13	Kobe	Japan	74	21.3 µg/m³	213.0 µg/m³
14	Nanjing	China	68	18.0 µg/m³	210.0 µg/m³
15	Taizhou	China	66	17.2 µg/m³	209.0 µg/m³
=16	Jakarta	Indonesia	116	41.4 µg/m³	207.0 µg/m³
=16	Bekasi	Indonesia	116	41.4 µg/m³	207.0 µg/m³
=16	South Tangerang	Indonesia	116	41.4 µg/m³	207.0 µg/m³
17	Yixing	China	74	21.4 µg/m³	205.0 µg/m³
18	Fushun	China	71	19.8 µg/m³	204.0 µg/m³
=19	Hanoi	Vietnam	101	35.6 µg/m³	202.0 µg/m³
=19	Baoding	China	87	28.2 µg/m³	202.0 µg/m³
=19	Bandung	Indonesia	100	35.2 µg/m³	202.0 µg/m³
20	Shaoxing	China	63	15.7 µg/m³	201.0 µg/m³
=21	Shanghai	China	115	41.2 µg/m³	200.0 µg/m³
=21	Shenyang	China	71	20.1 µg/m³	200.0 µg/m³
=22	Daejeon	South Korea	64	16.2 µg/m³	199.0 µg/m³
=22	Suwon	South Korea	77	22.9 µg/m³	199.0 µg/m³
=23	Busan	South Korea	63	15.3 µg/m³	198.0 µg/m³
=23	Semarang	Indonesia	106	37.5 µg/m³	198.0 µg/m³
24	Yangzhou	China	63	15.7 µg/m³	197.0 µg/m³
=25	Qingdao	China	111	39.6 µg/m³	196.0 µg/m³
=25	Daegu	South Korea	59	13.5 µg/m³	196.0 µg/m³
=25	Depok	Indonesia	119	42.7 µg/m³	196.0 µg/m³
=25	Jinzhong	China	66	17.0 µg/m³	196.0 µg/m³
=26	Hangzhou	China	67	17.6 µg/m³	194.0 µg/m³
=26	Handan	China	76	22.6 µg/m³	194.0 µg/m³
27	Tianjin	China	95	32.7 µg/m³	193.0 µg/m³
28	Dalian	China	104	36.8 µg/m³	192.0 µg/m³
29	Zhengzhou	China	78	23.6 µg/m³	191.0 µg/m³
30	Yantai	China	61	14.4 µg/m³	190.0 µg/m³
31	Taiyuan	China	63	15.7 µg/m³	187.0 µg/m³
=32	Seoul	South Korea	80	24.6 µg/m³	186.0 µg/m³
=32	Incheon	South Korea	80	24.6 µg/m³	186.0 µg/m³
=32	Anshan	China	79	24.2 µg/m³	186.0 µg/m³
33	Yiwu	China	58	13.0 µg/m³	184.0 µg/m³
34	Gwangju	South Korea	69	19.0 µg/m³	183.0 µg/m³
35	Peshawar	Pakistan	96	33.2 µg/m³	180.0 µg/m³
36	Changzhou	China	62	14.8 µg/m³	179.0 µg/m³
37	Changchun	China	61	14.6 µg/m³	178.0 µg/m³
=38	Xi’an	China	81	25.2 µg/m³	177.0 µg/m³
=38	Tangerang	Indonesia	97	33.8 µg/m³	177.0 µg/m³
39	Yancheng	China	62	15.1 µg/m³	176.0 µg/m³
=40	Linyi	China	62	15.0 µg/m³	175.0 µg/m³
=40	Xuzhou	China	59	13.6 µg/m³	175.0 µg/m³
41	Lahore	Pakistan	96	33.4 µg/m³	173.0 µg/m³
=42	Zibo	China	62	14.8 µg/m³	172.0 µg/m³
=42	Osaka	Japan	60	13.9 µg/m³	172.0 µg/m³
=43	Weifang	China	58	13.0 µg/m³	169.0 µg/m³
=43	Fukuoka	Japan	68	18.1 µg/m³	169.0 µg/m³
44	Tai’an	China	63	15.8 µg/m³	168.0 µg/m³
=45	Manila	Philippines	80	24.8 µg/m³	166.0 µg/m³
=45	Caloocan City	Philippines	80	24.8 µg/m³	166.0 µg/m³
=45	Luoyang	China	80	24.9 µg/m³	166.0 µg/m³
=46	Shijiazhuang	China	65	16.8 µg/m³	165.0 µg/m³
=46	Jilin	China	59	13.4 µg/m³	165.0 µg/m³
=47	Huai'an	China	61	14.4 µg/m³	164.0 µg/m³
=47	Putian	China	71	19.7 µg/m³	164.0 µg/m³
=47	Jinhua	China	55	11.0 µg/m³	164.0 µg/m³
48	Hefei	China	59	13.3 µg/m³	163.0 µg/m³
49	Jinan	China	62	15.2 µg/m³	162.0 µg/m³
=50	Pyongyang	North Korea	77	23.3 µg/m³	160.0 µg/m³
=50	Liaocheng	China	61	14.5 µg/m³	160.0 µg/m³
51	Chongqing	China	57	12.3 µg/m³	159.0 µg/m³
=52	Datong	China	66	16.9 µg/m³	158.0 µg/m³
=52	Jepara	Indonesia	88	28.9 µg/m³	158.0 µg/m³
=53	Kuala Lumpur	Malaysia	71	19.6 µg/m³	157.0 µg/m³
=53	Hyderabad	Pakistan	129	46.8 µg/m³	157.0 µg/m³
54	Najafgarh	India	99	34.6 µg/m³	155.0 µg/m³
=55	Quanzhou	China	86	27.9 µg/m³	154.0 µg/m³
=55	Jinjiang	China	86	27.9 µg/m³	154.0 µg/m³
=56	Taipei	Taiwan	99	34.8 µg/m³	152.0 µg/m³
=56	Xiangyang	China	61	14.4 µg/m³	152.0 µg/m³
=56	Jining	China	65	16.4 µg/m³	152.0 µg/m³
57	Ludhiāna	India	81	25.4 µg/m³	151.0 µg/m³
=58	Kabul	Afghanistan	66	17.1 µg/m³	150.0 µg/m³
=58	Bozhou	China	55	11.2 µg/m³	150.0 µg/m³
59	Kaifeng	China	59	13.6 µg/m³	149.0 µg/m³
=60	Shangqiu	China	58	12.6 µg/m³	148.0 µg/m³
=60	Multan	Pakistan	71	19.8 µg/m³	148.0 µg/m³
=60	Luohe	China	57	12.3 µg/m³	148.0 µg/m³
61	Lianyungang	China	58	12.6 µg/m³	147.0 µg/m³
=62	Faisalabad	Pakistan	84	26.7 µg/m³	146.0 µg/m³
=62	Nanyang	China	62	15.1 µg/m³	146.0 µg/m³
=63	Delhi	India	92	31.0 µg/m³	145.0 µg/m³
=63	Nanchong	China	67	17.6 µg/m³	145.0 µg/m³
=63	Wuhu	China	55	11.1 µg/m³	145.0 µg/m³

Methodology: Current pollutant concentrations are sampled from WeatherAPI for up to 400 large cities; US AQI values are calculated from PM2.5 using EPA breakpoints.

Why Is Ground-Level Ozone So High in These Cities?

Ground-level ozone forms when sunlight drives reactions between pollutants from traffic, industry and other sources. Concentrations often peak on warm, sunny afternoons and can irritate the lungs even when particle pollution is modest.

Frequently Asked Questions: Cities With the Highest Ozone Right Now

Which city has the highest ozone right now?

Among the major cities we track, Cixi has the highest current ozone concentration at about 297.0 µg/m³ (as of August 1, 2026).

Is ground-level ozone the same as the ozone layer?

It is the same molecule but in the wrong place: stratospheric ozone protects Earth, while ozone near the ground is a harmful air pollutant.

Cities With the Highest Ozone Right Now

Top Cities Ranked by Ozone (O3)

Why Is Ground-Level Ozone So High in These Cities?

Frequently Asked Questions: Cities With the Highest Ozone Right Now

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