LIVE • 2026-07-11

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 Rio de Janeiro, Brazil at 197.0 ppb. WHO 2021 8-hour guideline: 100 μg/m³ (~50 ppb).

#1
197.0 ppb

BR

Rio de Janeiro

95
AQI
PM2.5
39.7μg
PM10
40.0μg
O3
197.0ppb
Moderate
#2
196.0 ppb

QA

Doha

204
AQI
PM2.5
76.8μg
PM10
188.6μg
O3
196.0ppb
Very Unhealthy
#3
167.0 ppb

AE

Abu Dhabi

160
AQI
PM2.5
73.3μg
PM10
165.3μg
O3
167.0ppb
Unhealthy
#4
158.0 ppb

AE

Dubai

171
AQI
PM2.5
77.1μg
PM10
183.5μg
O3
158.0ppb
Unhealthy
#5
157.0 ppb

KZ

Almaty

181
AQI
PM2.5
22.8μg
PM10
26.5μg
O3
157.0ppb
Unhealthy
#6
151.0 ppb

AO

Luanda

71
AQI
PM2.5
22.9μg
PM10
27.4μg
O3
151.0ppb
Moderate
#7
148.0 ppb

CD

Kinshasa

98
AQI
PM2.5
40.2μg
PM10
42.7μg
O3
148.0ppb
Moderate
#8
137.0 ppb

OM

Muscat

154
AQI
PM2.5
62.6μg
PM10
153.7μg
O3
137.0ppb
Unhealthy
#9
133.0 ppb

DZ

Algiers

49
AQI
PM2.5
11.8μg
PM10
23.1μg
O3
133.0ppb
Good
#10
132.0 ppb

BR

Sao Paulo

145
AQI
PM2.5
15.3μg
PM10
15.3μg
O3
132.0ppb
Unhealthy for Sensitive Groups
#11
131.0 ppb

IT

Milan

66
AQI
PM2.5
8.9μg
PM10
12.8μg
O3
131.0ppb
Moderate
#12
130.0 ppb

RS

Belgrade

51
AQI
PM2.5
25.2μg
PM10
35.1μg
O3
130.0ppb
Moderate
#13
125.0 ppb

ZA

Johannesburg

159
AQI
PM2.5
22.9μg
PM10
23.1μg
O3
125.0ppb
Unhealthy
#14
125.0 ppb

BR

Belo Horizonte

55
AQI
PM2.5
7.7μg
PM10
7.9μg
O3
125.0ppb
Moderate
#15
123.0 ppb

SA

Jeddah

64
AQI
PM2.5
19.9μg
PM10
27.6μg
O3
123.0ppb
Moderate
#16
121.0 ppb

IN

Chennai

88
AQI
PM2.5
28.3μg
PM10
48.4μg
O3
121.0ppb
Moderate
#17
120.0 ppb

AF

Kabul

93
AQI
PM2.5
9.5μg
PM10
39.3μg
O3
120.0ppb
Moderate
#18
119.0 ppb

IT

Naples

46
AQI
PM2.5
9.1μg
PM10
13.7μg
O3
119.0ppb
Good
#19
119.0 ppb

CO

Medellin

45
AQI
PM2.5
6.9μg
PM10
7.2μg
O3
119.0ppb
Good
#20
118.0 ppb

GR

Athens

52
AQI
PM2.5
8.2μg
PM10
10.4μg
O3
118.0ppb
Moderate
#21
116.0 ppb

BE

Brussels

37
AQI
PM2.5
7.8μg
PM10
12.6μg
O3
116.0ppb
Good
#22
115.0 ppb

IR

Tehran

89
AQI
PM2.5
15.6μg
PM10
38.8μg
O3
115.0ppb
Moderate
#23
115.0 ppb

JO

Amman

48
AQI
PM2.5
8.5μg
PM10
13.5μg
O3
115.0ppb
Good
#24
114.0 ppb

EG

Cairo

57
AQI
PM2.5
11.8μg
PM10
14.2μg
O3
114.0ppb
Moderate
#25
113.0 ppb

FR

Paris

42
AQI
PM2.5
6.0μg
PM10
9.1μg
O3
113.0ppb
Good
#26
113.0 ppb

TR

Ankara

45
AQI
PM2.5
5.7μg
PM10
7.9μg
O3
113.0ppb
Good
#27
112.0 ppb

UZ

Tashkent

95
AQI
PM2.5
6.2μg
PM10
7.0μg
O3
112.0ppb
Moderate
#28
111.0 ppb

TR

Izmir

48
AQI
PM2.5
6.6μg
PM10
10.4μg
O3
111.0ppb
Good
#29
111.0 ppb

DE

Munich

38
AQI
PM2.5
5.6μg
PM10
9.5μg
O3
111.0ppb
Good
#30
111.0 ppb

AL

Tirana

48
AQI
PM2.5
5.9μg
PM10
7.5μg
O3
111.0ppb
Good

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