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)
54
Moderate
Colchester, Essex
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
10.57 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
21.37 μg/m³
0
55
155
255
425
605+
50.36 ppb
0
55
71
86
201
201+
1.31 ppb
0
36
76
186
605
1005+
7.63 ppb
0
54
101
361
1250
2050+
0.07 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
High
Colchester, Essex
Colchester, Essex
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AQI 42
Good
4.61μg/m³
PM2.5
10.97μg/m³
PM10
44.97ppb
O3
0.90ppb
SO2
3.99ppb
NO2
0.29ppm
CO
AQI 39
Good
4.62μg/m³
PM2.5
9.91μg/m³
PM10
42.01ppb
O3
0.91ppb
SO2
4.06ppb
NO2
0.29ppm
CO
AQI 34
Good
4.36μg/m³
PM2.5
11.33μg/m³
PM10
36.58ppb
O3
0.86ppb
SO2
4.01ppb
NO2
0.29ppm
CO
AQI 39
Good
4.33μg/m³
PM2.5
9.37μg/m³
PM10
42.20ppb
O3
0.85ppb
SO2
3.68ppb
NO2
0.29ppm
CO
AQI 31
Good
4.64μg/m³
PM2.5
11.19μg/m³
PM10
33.05ppb
O3
0.87ppb
SO2
3.40ppb
NO2
0.29ppm
CO
AQI 27
Good
4.83μg/m³
PM2.5
8.57μg/m³
PM10
25.26ppb
O3
0.82ppb
SO2
3.27ppb
NO2
0.29ppm
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 07:00:00 on 2025-06-15.
In the last 24 hours, the best air quality in Colchester, Essex was observed at 12:00:00 on 2025-06-16.
As of now, the AQI in Colchester, Essex is 37, 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 4.385 μg/m3.
The PM10 concentration in Colchester, Essex is 8.909 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Colchester, Essex is 0.288 ppm.
Currently, Colchester, Essex has a sulfur dioxide (SO2) concentration of 0.862 ppb.
The current ozone (O3) level in Colchester, Essex at the moment is 40.464 ppm.
Nitrogen dioxide (NO2) level in Colchester, Essex at the moment is 3.632 ppb.
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