Stay updated with real-time air quality in Shelton, 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)
40
Good
Shelton, Connecticut
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.57 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
15.86 μg/m³
0
55
155
255
425
605+
42.64 ppb
0
55
71
86
201
201+
0.36 ppb
0
36
76
186
605
1005+
5.26 ppb
0
54
101
361
1250
2050+
0.17 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Shelton, Connecticut
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AQI 40
Good
5.57μg/m³
PM2.5
15.86μg/m³
PM10
42.64ppb
O3
0.36ppb
SO2
5.26ppb
NO2
0.17ppm
CO
AQI 40
Good
5.57μg/m³
PM2.5
15.86μg/m³
PM10
42.64ppb
O3
0.36ppb
SO2
5.26ppb
NO2
0.17ppm
CO
AQI 41
Good
5.43μg/m³
PM2.5
13.48μg/m³
PM10
43.60ppb
O3
0.34ppb
SO2
6.70ppb
NO2
0.16ppm
CO
AQI 40
Good
5.64μg/m³
PM2.5
15.87μg/m³
PM10
43.26ppb
O3
0.36ppb
SO2
5.36ppb
NO2
0.17ppm
CO
AQI 40
Good
5.55μg/m³
PM2.5
16.96μg/m³
PM10
43.05ppb
O3
0.38ppb
SO2
4.86ppb
NO2
0.20ppm
CO
AQI 44
Good
5.48μg/m³
PM2.5
14.81μg/m³
PM10
46.75ppb
O3
0.40ppb
SO2
5.59ppb
NO2
0.18ppm
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 Shelton, Connecticut is updated every hour for accuracy.
In the past 24 hours, the air quality in Shelton, Connecticut was at its worst at 01:00:00 on 2026-03-29.
In the last 24 hours, the best air quality in Shelton, Connecticut was observed at 03:00:00 on 2026-03-29.
As of now, the AQI in Shelton, Connecticut is 40, indicating Good conditions.
Shelton, Connecticut air has the highest levels of O3.
Poor air quality in Shelton, Connecticut means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Shelton, Connecticut are currently 5.574 μg/m3.
The PM10 concentration in Shelton, Connecticut is 15.855 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Shelton, Connecticut is 0.171 ppm.
Currently, Shelton, Connecticut has a sulfur dioxide (SO2) concentration of 0.365 ppb.
The current ozone (O3) level in Shelton, Connecticut at the moment is 42.642 ppm.
Nitrogen dioxide (NO2) level in Shelton, Connecticut at the moment is 5.265 ppb.
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