Stay updated with real-time air quality in Monroe, 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)
42
Good
Monroe, Connecticut
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.36 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
13.50 μg/m³
0
55
155
255
425
605+
44.93 ppb
0
55
71
86
201
201+
0.32 ppb
0
36
76
186
605
1005+
3.47 ppb
0
54
101
361
1250
2050+
0.22 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Monroe, Connecticut
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AQI 43
Good
4.99μg/m³
PM2.5
19.38μg/m³
PM10
46.30ppb
O3
0.31ppb
SO2
4.71ppb
NO2
0.19ppm
CO
AQI 43
Good
4.99μg/m³
PM2.5
19.38μg/m³
PM10
46.30ppb
O3
0.31ppb
SO2
4.71ppb
NO2
0.19ppm
CO
AQI 43
Good
5.39μg/m³
PM2.5
14.77μg/m³
PM10
46.02ppb
O3
0.37ppb
SO2
3.13ppb
NO2
0.22ppm
CO
AQI 43
Good
4.99μg/m³
PM2.5
19.38μg/m³
PM10
46.30ppb
O3
0.31ppb
SO2
4.71ppb
NO2
0.19ppm
CO
AQI 43
Good
5.48μg/m³
PM2.5
13.14μg/m³
PM10
45.93ppb
O3
0.30ppb
SO2
3.53ppb
NO2
0.22ppm
CO
AQI 42
Good
5.18μg/m³
PM2.5
20.11μg/m³
PM10
45.14ppb
O3
0.31ppb
SO2
4.63ppb
NO2
0.19ppm
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 Monroe, Connecticut is updated every hour for accuracy.
In the past 24 hours, the air quality in Monroe, Connecticut was at its worst at 01:00:00 on 2026-03-29.
In the last 24 hours, the best air quality in Monroe, Connecticut was observed at 03:00:00 on 2026-03-29.
As of now, the AQI in Monroe, Connecticut is 42, indicating Good conditions.
Monroe, Connecticut air has the highest levels of O3.
Poor air quality in Monroe, Connecticut means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Monroe, Connecticut are currently 5.361 μg/m3.
The PM10 concentration in Monroe, Connecticut is 13.503 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Monroe, Connecticut is 0.217 ppm.
Currently, Monroe, Connecticut has a sulfur dioxide (SO2) concentration of 0.321 ppb.
The current ozone (O3) level in Monroe, Connecticut at the moment is 44.929 ppm.
Nitrogen dioxide (NO2) level in Monroe, Connecticut at the moment is 3.466 ppb.
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