Stay updated with real-time air quality in Stonington, 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)
58
Moderate
Stonington, Connecticut
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
9.72 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
43.26 μg/m³
0
55
155
255
425
605+
56.51 ppb
0
55
71
86
201
201+
0.27 ppb
0
36
76
186
605
1005+
7.75 ppb
0
54
101
361
1250
2050+
0.25 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Stonington, Connecticut
Stonington, Connecticut
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AQI 52
Moderate
9.60μg/m³
PM2.5
34.30μg/m³
PM10
20.53ppb
O3
0.21ppb
SO2
14.12ppb
NO2
0.35ppm
CO
AQI 58
Moderate
12.67μg/m³
PM2.5
18.17μg/m³
PM10
27.93ppb
O3
0.20ppb
SO2
14.13ppb
NO2
0.33ppm
CO
AQI 56
Moderate
11.79μg/m³
PM2.5
23.91μg/m³
PM10
25.44ppb
O3
0.22ppb
SO2
13.53ppb
NO2
0.34ppm
CO
AQI 58
Moderate
12.67μg/m³
PM2.5
18.17μg/m³
PM10
27.93ppb
O3
0.20ppb
SO2
14.13ppb
NO2
0.33ppm
CO
AQI 56
Moderate
12.43μg/m³
PM2.5
19.89μg/m³
PM10
27.23ppb
O3
0.20ppb
SO2
14.04ppb
NO2
0.33ppm
CO
AQI 56
Moderate
11.95μg/m³
PM2.5
23.15μg/m³
PM10
26.17ppb
O3
0.20ppb
SO2
13.83ppb
NO2
0.33ppm
CO
Air quality and pollutant data for Connecticut, USA 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 Stonington, Connecticut is updated every hour for accuracy.
In the past 24 hours, the air quality in Stonington, Connecticut was at its worst at 12:00:00 on 2025-07-30.
In the last 24 hours, the best air quality in Stonington, Connecticut was observed at 12:00:00 on 2025-07-30.
As of now, the AQI in Stonington, Connecticut is 49, indicating Good conditions.
Stonington, Connecticut air has the highest levels of PM2.5.
Poor air quality in Stonington, Connecticut means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Stonington, Connecticut are currently 9.185 μg/m3.
The PM10 concentration in Stonington, Connecticut is 26.384 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Stonington, Connecticut is 0.295 ppm.
Currently, Stonington, Connecticut has a sulfur dioxide (SO2) concentration of 0.218 ppb.
The current ozone (O3) level in Stonington, Connecticut at the moment is 28.196 ppm.
Nitrogen dioxide (NO2) level in Stonington, Connecticut at the moment is 9.239 ppb.
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