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)
33
Good
Chelmsford, Essex
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
5.75 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
9.85 μg/m³
0
55
155
255
425
605+
27.68 ppb
0
55
71
86
201
201+
0.80 ppb
0
36
76
186
605
1005+
3.71 ppb
0
54
101
361
1250
2050+
0.03 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Chelmsford, Essex
Chelmsford, Essex
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AQI 16
Good
3.17μg/m³
PM2.5
9.81μg/m³
PM10
14.13ppb
O3
0.89ppb
SO2
4.54ppb
NO2
0.03ppm
CO
AQI 16
Good
3.35μg/m³
PM2.5
9.49μg/m³
PM10
16.19ppb
O3
0.91ppb
SO2
4.74ppb
NO2
0.04ppm
CO
AQI 17
Good
3.18μg/m³
PM2.5
9.46μg/m³
PM10
17.77ppb
O3
0.90ppb
SO2
4.58ppb
NO2
0.04ppm
CO
AQI 16
Good
3.18μg/m³
PM2.5
7.86μg/m³
PM10
15.58ppb
O3
0.88ppb
SO2
4.39ppb
NO2
0.04ppm
CO
AQI 16
Good
3.38μg/m³
PM2.5
8.34μg/m³
PM10
14.79ppb
O3
0.84ppb
SO2
8.80ppb
NO2
0.03ppm
CO
AQI 22
Good
3.51μg/m³
PM2.5
9.87μg/m³
PM10
15.18ppb
O3
0.91ppb
SO2
4.61ppb
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 05:00:00 on 2025-07-23.
In the last 24 hours, the best air quality in Chelmsford, Essex was observed at 07:00:00 on 2025-07-23.
As of now, the AQI in Chelmsford, Essex is 17, indicating Good conditions.
Chelmsford, Essex air has the highest levels of O3.
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 3.205 μg/m3.
The PM10 concentration in Chelmsford, Essex is 9.706 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Chelmsford, Essex is 0.03 ppm.
Currently, Chelmsford, Essex has a sulfur dioxide (SO2) concentration of 0.907 ppb.
The current ozone (O3) level in Chelmsford, Essex at the moment is 18.298 ppm.
Nitrogen dioxide (NO2) level in Chelmsford, Essex at the moment is 6.443 ppb.
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