Stay updated with real-time air quality in Colchester, Essex 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)
32
Good
Colchester, Essex
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
4.22 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
9.07 μg/m³
0
55
155
255
425
605+
35.18 ppb
0
55
71
86
201
201+
0.43 ppb
0
36
76
186
605
1005+
2.56 ppb
0
54
101
361
1250
2050+
0.05 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Colchester, Essex
Colchester, Essex
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AQI 35
Good
4.34μg/m³
PM2.5
8.98μg/m³
PM10
37.93ppb
O3
0.45ppb
SO2
2.66ppb
NO2
0.04ppm
CO
AQI 36
Good
4.35μg/m³
PM2.5
8.97μg/m³
PM10
38.64ppb
O3
0.47ppb
SO2
2.12ppb
NO2
0.05ppm
CO
AQI 33
Good
4.00μg/m³
PM2.5
9.27μg/m³
PM10
35.53ppb
O3
0.49ppb
SO2
2.70ppb
NO2
0.04ppm
CO
AQI 34
Good
5.14μg/m³
PM2.5
9.23μg/m³
PM10
36.83ppb
O3
0.43ppb
SO2
2.38ppb
NO2
0.06ppm
CO
AQI 32
Good
4.08μg/m³
PM2.5
9.19μg/m³
PM10
35.45ppb
O3
0.49ppb
SO2
2.71ppb
NO2
0.04ppm
CO
AQI 32
Good
4.28μg/m³
PM2.5
10.94μg/m³
PM10
34.84ppb
O3
0.47ppb
SO2
4.65ppb
NO2
0.04ppm
CO
Air quality and pollutant data for Essex, UK are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.
Source: Ambee Data Sources
The air quality information for Colchester, Essex is updated every hour for accuracy.
In the past 24 hours, the air quality in Colchester, Essex was at its worst at 11:00:00 on 2026-03-28.
In the last 24 hours, the best air quality in Colchester, Essex was observed at 01:00:00 on 2026-03-29.
As of now, the AQI in Colchester, Essex is 32, indicating Good conditions.
Colchester, Essex air has the highest levels of O3.
Poor air quality in Colchester, Essex means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Colchester, Essex are currently 4.225 μg/m3.
The PM10 concentration in Colchester, Essex is 9.07 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Colchester, Essex is 0.051 ppm.
Currently, Colchester, Essex has a sulfur dioxide (SO2) concentration of 0.431 ppb.
The current ozone (O3) level in Colchester, Essex at the moment is 35.181 ppm.
Nitrogen dioxide (NO2) level in Colchester, Essex at the moment is 2.555 ppb.
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