Stay updated with real-time air quality in Chelmsford, 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)
58
Moderate
Chelmsford, Essex
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
13.36 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
24.33 μg/m³
0
55
155
255
425
605+
45.19 ppb
0
55
71
86
201
201+
0.81 ppb
0
36
76
186
605
1005+
11.92 ppb
0
54
101
361
1250
2050+
0.04 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
High
Chelmsford, Essex
Chelmsford, Essex
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AQI 54
Moderate
11.15μg/m³
PM2.5
24.54μg/m³
PM10
42.75ppb
O3
0.80ppb
SO2
7.60ppb
NO2
0.04ppm
CO
AQI 58
Moderate
13.32μg/m³
PM2.5
24.27μg/m³
PM10
46.83ppb
O3
0.81ppb
SO2
10.04ppb
NO2
0.05ppm
CO
AQI 54
Moderate
11.04μg/m³
PM2.5
24.34μg/m³
PM10
42.85ppb
O3
0.80ppb
SO2
10.97ppb
NO2
0.04ppm
CO
AQI 54
Moderate
11.37μg/m³
PM2.5
24.44μg/m³
PM10
42.47ppb
O3
0.80ppb
SO2
12.46ppb
NO2
0.04ppm
CO
AQI 58
Moderate
13.16μg/m³
PM2.5
24.72μg/m³
PM10
42.29ppb
O3
0.77ppb
SO2
12.79ppb
NO2
0.04ppm
CO
AQI 52
Moderate
10.39μg/m³
PM2.5
23.70μg/m³
PM10
43.39ppb
O3
0.81ppb
SO2
12.03ppb
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 Chelmsford, Essex is updated every hour for accuracy.
In the past 24 hours, the air quality in Chelmsford, Essex was at its worst at 10:00:00 on 2025-06-12.
In the last 24 hours, the best air quality in Chelmsford, Essex was observed at 07:00:00 on 2025-06-12.
As of now, the AQI in Chelmsford, Essex is 58, indicating Moderate conditions.
Chelmsford, Essex air has the highest levels of PM2.5.
Poor air quality in Chelmsford, Essex means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Chelmsford, Essex are currently 13.362 μg/m3.
The PM10 concentration in Chelmsford, Essex is 24.326 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Chelmsford, Essex is 0.037 ppm.
Currently, Chelmsford, Essex has a sulfur dioxide (SO2) concentration of 0.806 ppb.
The current ozone (O3) level in Chelmsford, Essex at the moment is 45.191 ppm.
Nitrogen dioxide (NO2) level in Chelmsford, Essex at the moment is 11.921 ppb.
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