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)
49
Good
Colchester, Essex
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
8.54 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
14.49 μg/m³
0
55
155
255
425
605+
27.79 ppb
0
55
71
86
201
201+
1.01 ppb
0
36
76
186
605
1005+
4.59 ppb
0
54
101
361
1250
2050+
0.26 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
High
Colchester, Essex
Colchester, Essex
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AQI 19
Good
3.05μg/m³
PM2.5
7.20μg/m³
PM10
20.44ppb
O3
0.85ppb
SO2
3.48ppb
NO2
0.03ppm
CO
AQI 19
Good
3.25μg/m³
PM2.5
7.92μg/m³
PM10
20.70ppb
O3
0.85ppb
SO2
3.39ppb
NO2
0.04ppm
CO
AQI 19
Good
3.17μg/m³
PM2.5
7.03μg/m³
PM10
19.56ppb
O3
0.87ppb
SO2
3.58ppb
NO2
0.03ppm
CO
AQI 20
Good
3.11μg/m³
PM2.5
7.57μg/m³
PM10
21.64ppb
O3
0.86ppb
SO2
2.62ppb
NO2
0.05ppm
CO
AQI 19
Good
2.54μg/m³
PM2.5
7.04μg/m³
PM10
20.09ppb
O3
0.87ppb
SO2
3.72ppb
NO2
0.03ppm
CO
AQI 19
Good
2.54μg/m³
PM2.5
7.01μg/m³
PM10
20.79ppb
O3
0.87ppb
SO2
3.65ppb
NO2
0.03ppm
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 08:00:00 on 2025-07-21.
In the last 24 hours, the best air quality in Colchester, Essex was observed at 07:00:00 on 2025-07-22.
As of now, the AQI in Colchester, Essex is 23, 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 2.862 μg/m3.
The PM10 concentration in Colchester, Essex is 7.875 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Colchester, Essex is 0.049 ppm.
Currently, Colchester, Essex has a sulfur dioxide (SO2) concentration of 0.876 ppb.
The current ozone (O3) level in Colchester, Essex at the moment is 24.714 ppm.
Nitrogen dioxide (NO2) level in Colchester, Essex at the moment is 2.815 ppb.
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