Stay updated with real-time air quality in Cardiff, Wales featuring accurate data on AQI, PM2.5, PM10, O3, NO2, SO2, and CO levels. Use our interactive map and detailed forecasts to monitor pollution trends, manage health risks, and plan your daily activities with confidence.
Live AQI (Air Quality Index)
31
Good
Cardiff, Wales
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
2.65 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
11.95 μg/m³
0
55
155
255
425
605+
33.05 ppb
0
55
71
86
201
201+
0.38 ppb
0
36
76
186
605
1005+
1.08 ppb
0
54
101
361
1250
2050+
0.44 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Cardiff, Wales
Cardiff, Wales
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AQI 31
Good
2.68μg/m³
PM2.5
10.84μg/m³
PM10
33.83ppb
O3
0.38ppb
SO2
2.56ppb
NO2
0.30ppm
CO
AQI 32
Good
3.25μg/m³
PM2.5
10.54μg/m³
PM10
35.13ppb
O3
0.38ppb
SO2
2.34ppb
NO2
0.30ppm
CO
AQI 31
Good
4.52μg/m³
PM2.5
10.36μg/m³
PM10
34.45ppb
O3
0.38ppb
SO2
2.29ppb
NO2
0.30ppm
CO
AQI 32
Good
4.45μg/m³
PM2.5
8.01μg/m³
PM10
34.77ppb
O3
0.96ppb
SO2
2.21ppb
NO2
0.30ppm
CO
AQI 34
Good
4.21μg/m³
PM2.5
9.72μg/m³
PM10
37.28ppb
O3
0.38ppb
SO2
1.92ppb
NO2
0.30ppm
CO
AQI 35
Good
4.95μg/m³
PM2.5
9.06μg/m³
PM10
37.96ppb
O3
0.38ppb
SO2
1.61ppb
NO2
0.30ppm
CO
The air quality data for Wales, UK is gathered from reliable sources such as satellites and monitoring stations, adhering to US EPA guidelines. With the help of advanced algorithms and machine learning, factors like traffic and population density are analyzed to deliver accurate and dependable results.
Source: Ambee Data Sources
Air quality updates for Cardiff, Wales are available every hour.
Cardiff, Wales experienced its worst air quality at 11:00:00, 2025-12-07.
The best air quality in Cardiff, Wales was observed at 07:00:00 on 2025-12-07.
The air quality in Cardiff, Wales right now is Good, with an AQI of 31.
In Cardiff, Wales, O3 is the most frequently found pollutant.
When air quality in Cardiff, Wales is compromised, staying indoors and wearing a mask can reduce health risks.
Cardiff, Wales currently has a PM2.5 concentration of 2.451 μg/m3.
Cardiff, Wales currently has a PM10 concentration of 10.969 μg/m3.
The current carbon monoxide (CO) level in Cardiff, Wales is 0.298 ppm.
The current sulfur dioxide (SO2) concentration in Cardiff, Wales is 0.382 ppb.
Cardiff, Wales currently has an ozone (O3) concentration of 33.434 ppm.
The current level of nitrogen dioxide (NO2) in Cardiff, Wales is 2.64 ppb.
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