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)
27
Good
Colchester, Essex
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.39 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
10.55 μg/m³
0
55
155
255
425
605+
28.09 ppb
0
55
71
86
201
201+
0.33 ppb
0
36
76
186
605
1005+
4.91 ppb
0
54
101
361
1250
2050+
0.13 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Colchester, Essex
Colchester, Essex
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AQI 31
Good
2.88μg/m³
PM2.5
18.20μg/m³
PM10
32.72ppb
O3
1.02ppb
SO2
2.20ppb
NO2
0.05ppm
CO
AQI 33
Good
5.73μg/m³
PM2.5
13.37μg/m³
PM10
24.52ppb
O3
0.36ppb
SO2
3.94ppb
NO2
0.12ppm
CO
AQI 31
Good
2.85μg/m³
PM2.5
6.45μg/m³
PM10
32.74ppb
O3
1.01ppb
SO2
2.94ppb
NO2
0.05ppm
CO
AQI 31
Good
4.07μg/m³
PM2.5
9.35μg/m³
PM10
32.79ppb
O3
0.23ppb
SO2
3.99ppb
NO2
0.13ppm
CO
AQI 31
Good
2.83μg/m³
PM2.5
8.29μg/m³
PM10
32.75ppb
O3
1.00ppb
SO2
2.94ppb
NO2
0.04ppm
CO
AQI 28
Good
2.84μg/m³
PM2.5
7.12μg/m³
PM10
29.58ppb
O3
1.00ppb
SO2
2.92ppb
NO2
0.05ppm
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 2025-12-27.
In the last 24 hours, the best air quality in Colchester, Essex was observed at 08:00:00 on 2025-12-28.
As of now, the AQI in Colchester, Essex is 27, 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 5.391 μg/m3.
The PM10 concentration in Colchester, Essex is 10.551 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Colchester, Essex is 0.133 ppm.
Currently, Colchester, Essex has a sulfur dioxide (SO2) concentration of 0.331 ppb.
The current ozone (O3) level in Colchester, Essex at the moment is 28.085 ppm.
Nitrogen dioxide (NO2) level in Colchester, Essex at the moment is 4.91 ppb.
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