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)
38
Good
Colchester, Essex
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
6.82 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
12.26 μg/m³
0
55
155
255
425
605+
26.27 ppb
0
55
71
86
201
201+
1.05 ppb
0
36
76
186
605
1005+
12.03 ppb
0
54
101
361
1250
2050+
0.80 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Colchester, Essex
Colchester, Essex
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AQI 49
Good
8.90μg/m³
PM2.5
20.50μg/m³
PM10
27.39ppb
O3
1.08ppb
SO2
11.55ppb
NO2
1.01ppm
CO
AQI 49
Good
8.65μg/m³
PM2.5
11.99μg/m³
PM10
29.62ppb
O3
1.07ppb
SO2
9.82ppb
NO2
1.01ppm
CO
AQI 33
Good
6.17μg/m³
PM2.5
23.05μg/m³
PM10
32.13ppb
O3
1.11ppb
SO2
9.32ppb
NO2
1.01ppm
CO
AQI 33
Good
6.31μg/m³
PM2.5
11.20μg/m³
PM10
24.81ppb
O3
1.11ppb
SO2
10.93ppb
NO2
1.01ppm
CO
AQI 49
Good
8.91μg/m³
PM2.5
10.32μg/m³
PM10
27.56ppb
O3
1.10ppb
SO2
9.95ppb
NO2
1.01ppm
CO
AQI 33
Good
5.95μg/m³
PM2.5
23.60μg/m³
PM10
32.32ppb
O3
1.13ppb
SO2
9.37ppb
NO2
1.01ppm
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 05:00:00 on 2026-02-11.
In the last 24 hours, the best air quality in Colchester, Essex was observed at 06:00:00 on 2026-02-11.
As of now, the AQI in Colchester, Essex is 38, indicating Good conditions.
Colchester, Essex air has the highest levels of PM2.5.
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 6.823 μg/m3.
The PM10 concentration in Colchester, Essex is 12.26 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Colchester, Essex is 0.803 ppm.
Currently, Colchester, Essex has a sulfur dioxide (SO2) concentration of 1.053 ppb.
The current ozone (O3) level in Colchester, Essex at the moment is 26.266 ppm.
Nitrogen dioxide (NO2) level in Colchester, Essex at the moment is 12.034 ppb.
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