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)
25
Good
Colchester, Essex
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
3.57 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
7.95 μg/m³
0
55
155
255
425
605+
27.35 ppb
0
55
71
86
201
201+
0.78 ppb
0
36
76
186
605
1005+
2.29 ppb
0
54
101
361
1250
2050+
0.11 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Colchester, Essex
Colchester, Essex
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AQI 27
Good
3.38μg/m³
PM2.5
6.57μg/m³
PM10
29.22ppb
O3
0.90ppb
SO2
3.02ppb
NO2
0.12ppm
CO
AQI 25
Good
3.35μg/m³
PM2.5
6.44μg/m³
PM10
27.26ppb
O3
0.91ppb
SO2
2.56ppb
NO2
0.12ppm
CO
AQI 26
Good
3.71μg/m³
PM2.5
6.69μg/m³
PM10
28.18ppb
O3
0.87ppb
SO2
3.09ppb
NO2
0.12ppm
CO
AQI 25
Good
2.71μg/m³
PM2.5
6.71μg/m³
PM10
26.52ppb
O3
0.85ppb
SO2
1.71ppb
NO2
0.12ppm
CO
AQI 27
Good
3.36μg/m³
PM2.5
6.45μg/m³
PM10
29.22ppb
O3
0.89ppb
SO2
3.25ppb
NO2
0.12ppm
CO
AQI 25
Good
3.67μg/m³
PM2.5
7.02μg/m³
PM10
26.84ppb
O3
0.83ppb
SO2
2.39ppb
NO2
0.12ppm
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 09:00:00 on 2026-05-13.
In the last 24 hours, the best air quality in Colchester, Essex was observed at 07:00:00 on 2026-05-14.
As of now, the AQI in Colchester, Essex is 25, 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 3.574 μg/m3.
The PM10 concentration in Colchester, Essex is 7.948 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Colchester, Essex is 0.108 ppm.
Currently, Colchester, Essex has a sulfur dioxide (SO2) concentration of 0.779 ppb.
The current ozone (O3) level in Colchester, Essex at the moment is 27.354 ppm.
Nitrogen dioxide (NO2) level in Colchester, Essex at the moment is 2.293 ppb.
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