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)
38
Good
Guilford, Connecticut
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
7.42 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
20.30 μg/m³
0
55
155
255
425
605+
29.58 ppb
0
55
71
86
201
201+
1.33 ppb
0
36
76
186
605
1005+
6.01 ppb
0
54
101
361
1250
2050+
0.19 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Guilford, Connecticut
Guilford, Connecticut
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AQI 38
Good
7.24μg/m³
PM2.5
23.13μg/m³
PM10
31.20ppb
O3
1.41ppb
SO2
7.91ppb
NO2
0.24ppm
CO
AQI 44
Good
7.59μg/m³
PM2.5
33.60μg/m³
PM10
32.18ppb
O3
1.53ppb
SO2
6.33ppb
NO2
0.22ppm
CO
AQI 44
Good
8.44μg/m³
PM2.5
19.19μg/m³
PM10
32.16ppb
O3
1.58ppb
SO2
7.22ppb
NO2
0.21ppm
CO
AQI 38
Good
7.14μg/m³
PM2.5
22.79μg/m³
PM10
31.07ppb
O3
1.40ppb
SO2
7.94ppb
NO2
0.24ppm
CO
AQI 49
Good
8.67μg/m³
PM2.5
17.04μg/m³
PM10
32.10ppb
O3
1.59ppb
SO2
6.99ppb
NO2
0.20ppm
CO
AQI 44
Good
8.46μg/m³
PM2.5
18.72μg/m³
PM10
32.20ppb
O3
1.61ppb
SO2
6.88ppb
NO2
0.21ppm
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 08:00:00 on 2025-07-16.
The best air quality in Guilford, Connecticut was recorded at 11:00:00 on 2025-07-16.
The real-time air quality index in Guilford, Connecticut is 44, currently categorized as Good.
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 7.735 μg/m3.
The current PM10 levels in Guilford, Connecticut are 23.62 μg/m3.
The current carbon monoxide (CO) level in Guilford, Connecticut is 0.193 ppm.
The current sulfur dioxide (SO2) levels in Guilford, Connecticut are 1.579 ppb.
The current ozone (O3) levels at Guilford, Connecticut is 29.924 ppm.
The current nitrogen dioxide (NO2) levels at Guilford, Connecticut is 5.91 ppb.
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