LIVE • 2026-08-25

Highest O3 cities right now

Top 30 cities ranked by current O3 concentration across all 217 tracked locations. Refreshes every 30 minutes. The highest O3 right now is in Chengdu, China at 282.0 ppb. WHO 2021 8-hour guideline: 100 μg/m³ (~50 ppb).

#1
282.0 ppb

CN

Chengdu

185
AQI
PM2.5
33.2μg
PM10
34.0μg
O3
282.0ppb
Unhealthy
#2
258.0 ppb

ID

Jakarta

167
AQI
PM2.5
54.5μg
PM10
56.5μg
O3
258.0ppb
Unhealthy
#3
255.0 ppb

IN

Delhi

152
AQI
PM2.5
56.7μg
PM10
77.3μg
O3
255.0ppb
Unhealthy
#4
245.0 ppb

ID

Bandung

161
AQI
PM2.5
40.9μg
PM10
41.9μg
O3
245.0ppb
Unhealthy
#5
240.0 ppb

PK

Lahore

165
AQI
PM2.5
47.5μg
PM10
71.2μg
O3
240.0ppb
Unhealthy
#6
237.0 ppb

MY

Kuala Lumpur

165
AQI
PM2.5
59.3μg
PM10
60.8μg
O3
237.0ppb
Unhealthy
#7
214.0 ppb

PK

Faisalabad

167
AQI
PM2.5
48.3μg
PM10
79.4μg
O3
214.0ppb
Unhealthy
#8
210.0 ppb

CN

Xian

130
AQI
PM2.5
19.2μg
PM10
19.4μg
O3
210.0ppb
Unhealthy for Sensitive Groups
#9
206.0 ppb

VN

Hanoi

102
AQI
PM2.5
35.3μg
PM10
35.6μg
O3
206.0ppb
Unhealthy for Sensitive Groups
#10
206.0 ppb

PK

Islamabad

102
AQI
PM2.5
28.2μg
PM10
41.2μg
O3
206.0ppb
Unhealthy for Sensitive Groups
#11
174.0 ppb

QA

Doha

163
AQI
PM2.5
75.4μg
PM10
224.9μg
O3
174.0ppb
Unhealthy
#12
161.0 ppb

JP

Fukuoka

114
AQI
PM2.5
18.6μg
PM10
20.7μg
O3
161.0ppb
Unhealthy for Sensitive Groups
#13
155.0 ppb

ID

Medan

112
AQI
PM2.5
19.2μg
PM10
20.0μg
O3
155.0ppb
Unhealthy for Sensitive Groups
#14
151.0 ppb

AF

Kabul

51
AQI
PM2.5
5.6μg
PM10
13.4μg
O3
151.0ppb
Moderate
#15
150.0 ppb

JP

Nagoya

132
AQI
PM2.5
17.1μg
PM10
18.9μg
O3
150.0ppb
Unhealthy for Sensitive Groups
#16
149.0 ppb

CN

Guangzhou

135
AQI
PM2.5
26.5μg
PM10
28.3μg
O3
149.0ppb
Unhealthy for Sensitive Groups
#17
145.0 ppb

ZA

Johannesburg

152
AQI
PM2.5
30.0μg
PM10
30.7μg
O3
145.0ppb
Unhealthy
#18
143.0 ppb

CN

Kunming

78
AQI
PM2.5
9.9μg
PM10
10.6μg
O3
143.0ppb
Moderate
#19
141.0 ppb

CN

Wuhan

65
AQI
PM2.5
9.6μg
PM10
10.5μg
O3
141.0ppb
Moderate
#20
141.0 ppb

MY

Johor Bahru

98
AQI
PM2.5
32.5μg
PM10
38.3μg
O3
141.0ppb
Moderate
#21
137.0 ppb

KR

Busan

93
AQI
PM2.5
33.2μg
PM10
35.0μg
O3
137.0ppb
Moderate
#22
132.0 ppb

IN

Jaipur

86
AQI
PM2.5
36.8μg
PM10
78.9μg
O3
132.0ppb
Moderate
#23
131.0 ppb

IR

Tehran

79
AQI
PM2.5
9.1μg
PM10
19.0μg
O3
131.0ppb
Moderate
#24
129.0 ppb

ZW

Harare

73
AQI
PM2.5
21.7μg
PM10
22.1μg
O3
129.0ppb
Moderate
#25
129.0 ppb

UZ

Tashkent

46
AQI
PM2.5
4.6μg
PM10
6.3μg
O3
129.0ppb
Good
#26
126.0 ppb

ID

Surabaya

93
AQI
PM2.5
17.5μg
PM10
18.6μg
O3
126.0ppb
Moderate
#27
125.0 ppb

NP

Pokhara

46
AQI
PM2.5
5.3μg
PM10
5.4μg
O3
125.0ppb
Good
#28
123.0 ppb

AE

Abu Dhabi

136
AQI
PM2.5
47.4μg
PM10
99.2μg
O3
123.0ppb
Unhealthy for Sensitive Groups
#29
123.0 ppb

KZ

Almaty

56
AQI
PM2.5
9.8μg
PM10
17.6μg
O3
123.0ppb
Moderate
#30
121.0 ppb

IN

Lucknow

96
AQI
PM2.5
21.5μg
PM10
21.9μg
O3
121.0ppb
Moderate

About O3

See the full O3 guide for sources, health effects, and mitigation. Or jump back to overall most polluted cities ranked by US EPA Air Quality Index.

See also: highest PM2.5 · highest PM10 · highest NO2