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)
27
Good
Colchester, Connecticut
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
4.58 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
15.97 μg/m³
0
55
155
255
425
605+
25.33 ppb
0
55
71
86
201
201+
0.27 ppb
0
36
76
186
605
1005+
5.71 ppb
0
54
101
361
1250
2050+
0.26 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Colchester, Connecticut
Colchester, Connecticut
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AQI 24
Good
3.87μg/m³
PM2.5
10.80μg/m³
PM10
25.82ppb
O3
0.23ppb
SO2
5.22ppb
NO2
0.37ppm
CO
AQI 22
Good
4.17μg/m³
PM2.5
10.58μg/m³
PM10
19.14ppb
O3
0.27ppb
SO2
6.13ppb
NO2
0.35ppm
CO
AQI 22
Good
3.67μg/m³
PM2.5
16.18μg/m³
PM10
23.96ppb
O3
0.25ppb
SO2
5.43ppb
NO2
0.33ppm
CO
AQI 27
Good
4.58μg/m³
PM2.5
10.64μg/m³
PM10
26.67ppb
O3
0.23ppb
SO2
7.31ppb
NO2
0.43ppm
CO
AQI 22
Good
3.80μg/m³
PM2.5
13.63μg/m³
PM10
23.63ppb
O3
0.24ppb
SO2
5.95ppb
NO2
0.35ppm
CO
AQI 24
Good
3.79μg/m³
PM2.5
12.98μg/m³
PM10
26.04ppb
O3
0.24ppb
SO2
4.74ppb
NO2
0.34ppm
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 01:00:00 on 2025-07-14.
The best air quality in Colchester, Connecticut was recorded at 12:00:00 on 2025-07-13.
The real-time air quality index in Colchester, Connecticut is 23, currently categorized as Good.
The most common pollutant in Colchester, Connecticut is O3.
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 3.69 μg/m3.
The current PM10 levels in Colchester, Connecticut are 13.839 μg/m3.
The current carbon monoxide (CO) level in Colchester, Connecticut is 0.344 ppm.
The current sulfur dioxide (SO2) levels in Colchester, Connecticut are 0.236 ppb.
The current ozone (O3) levels at Colchester, Connecticut is 25.47 ppm.
The current nitrogen dioxide (NO2) levels at Colchester, Connecticut is 4.957 ppb.
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