Stay updated with real-time air quality in Colchester, Connecticut 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, Connecticut
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
9.09 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
46.99 μg/m³
0
55
155
255
425
605+
25.46 ppb
0
55
71
86
201
201+
0.18 ppb
0
36
76
186
605
1005+
10.90 ppb
0
54
101
361
1250
2050+
0.30 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Colchester, Connecticut
Colchester, Connecticut
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AQI 60
Moderate
13.58μg/m³
PM2.5
31.07μg/m³
PM10
36.02ppb
O3
0.59ppb
SO2
13.31ppb
NO2
0.36ppm
CO
AQI 58
Moderate
12.50μg/m³
PM2.5
24.25μg/m³
PM10
45.66ppb
O3
0.44ppb
SO2
18.56ppb
NO2
0.34ppm
CO
AQI 58
Moderate
13.49μg/m³
PM2.5
39.05μg/m³
PM10
32.90ppb
O3
0.32ppb
SO2
7.91ppb
NO2
0.34ppm
CO
AQI 62
Moderate
15.27μg/m³
PM2.5
29.47μg/m³
PM10
41.31ppb
O3
0.52ppb
SO2
9.82ppb
NO2
0.38ppm
CO
AQI 56
Moderate
12.26μg/m³
PM2.5
40.11μg/m³
PM10
34.31ppb
O3
0.34ppb
SO2
8.22ppb
NO2
0.34ppm
CO
AQI 60
Moderate
13.98μg/m³
PM2.5
56.90μg/m³
PM10
35.51ppb
O3
0.32ppb
SO2
8.12ppb
NO2
0.35ppm
CO
Air quality measurements for Connecticut, USA meet strict US EPA standards. These measurements are collected from reliable sources, including satellites and ground-based monitoring systems. Advanced algorithms and machine learning techniques are applied to the data, factoring in variables such as traffic and population density, to ensure precision and reliability.
Source: Ambee Data Sources
Air quality data for Colchester, Connecticut is updated on an hourly basis.
The worst air quality in Colchester, Connecticut was recorded at 11:00:00 on 2025-07-29.
The best air quality in Colchester, Connecticut was recorded at 07:00:00 on 2025-07-28.
The real-time air quality index in Colchester, Connecticut is 60, currently categorized as Moderate.
The most common pollutant in Colchester, Connecticut is PM2.5.
If the air quality in Colchester, Connecticut is poor, limit outdoor activities and use a mask to safeguard your health.
The measured PM2.5 levels in Colchester, Connecticut at present are 13.958 μg/m3.
The current PM10 levels in Colchester, Connecticut are 51.268 μg/m3.
The current carbon monoxide (CO) level in Colchester, Connecticut is 0.359 ppm.
The current sulfur dioxide (SO2) levels in Colchester, Connecticut are 0.545 ppb.
The current ozone (O3) levels at Colchester, Connecticut is 35.269 ppm.
The current nitrogen dioxide (NO2) levels at Colchester, Connecticut is 7.983 ppb.
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