Stay updated with real-time air quality in Guilford, 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)
54
Moderate
Guilford, Connecticut
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
10.83 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
50.63 μg/m³
0
55
155
255
425
605+
16.78 ppb
0
55
71
86
201
201+
0.22 ppb
0
36
76
186
605
1005+
9.17 ppb
0
54
101
361
1250
2050+
0.29 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Guilford, Connecticut
Guilford, Connecticut
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AQI 60
Moderate
14.19μg/m³
PM2.5
54.42μg/m³
PM10
39.33ppb
O3
0.55ppb
SO2
15.51ppb
NO2
0.36ppm
CO
AQI 66
Moderate
16.77μg/m³
PM2.5
62.99μg/m³
PM10
44.10ppb
O3
0.63ppb
SO2
25.57ppb
NO2
0.36ppm
CO
AQI 67
Moderate
18.45μg/m³
PM2.5
41.77μg/m³
PM10
29.64ppb
O3
0.67ppb
SO2
28.85ppb
NO2
0.39ppm
CO
AQI 60
Moderate
13.99μg/m³
PM2.5
55.12μg/m³
PM10
39.30ppb
O3
0.55ppb
SO2
15.12ppb
NO2
0.36ppm
CO
AQI 69
Moderate
19.14μg/m³
PM2.5
35.84μg/m³
PM10
25.61ppb
O3
0.69ppb
SO2
31.84ppb
NO2
0.39ppm
CO
AQI 67
Moderate
18.04μg/m³
PM2.5
37.41μg/m³
PM10
28.43ppb
O3
0.67ppb
SO2
27.57ppb
NO2
0.39ppm
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 Guilford, Connecticut is updated on an hourly basis.
The worst air quality in Guilford, Connecticut was recorded at 05:00:00 on 2025-07-29.
The best air quality in Guilford, Connecticut was recorded at 08:00:00 on 2025-07-28.
The real-time air quality index in Guilford, Connecticut is 66, currently categorized as Moderate.
The most common pollutant in Guilford, Connecticut is PM2.5.
If the air quality in Guilford, Connecticut is poor, limit outdoor activities and use a mask to safeguard your health.
The measured PM2.5 levels in Guilford, Connecticut at present are 17.49 μg/m3.
The current PM10 levels in Guilford, Connecticut are 38.204 μg/m3.
The current carbon monoxide (CO) level in Guilford, Connecticut is 0.355 ppm.
The current sulfur dioxide (SO2) levels in Guilford, Connecticut are 0.616 ppb.
The current ozone (O3) levels at Guilford, Connecticut is 46.938 ppm.
The current nitrogen dioxide (NO2) levels at Guilford, Connecticut is 21.036 ppb.
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