Stay updated with real-time air quality in Danbury, 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)
27
Good
Danbury, Connecticut
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.40 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
12.02 μg/m³
0
55
155
255
425
605+
27.60 ppb
0
55
71
86
201
201+
0.33 ppb
0
36
76
186
605
1005+
9.67 ppb
0
54
101
361
1250
2050+
0.25 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Danbury, Connecticut
Danbury, Connecticut
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AQI 31
Good
2.70μg/m³
PM2.5
7.93μg/m³
PM10
33.65ppb
O3
0.49ppb
SO2
1.68ppb
NO2
0.10ppm
CO
AQI 31
Good
2.75μg/m³
PM2.5
7.94μg/m³
PM10
32.66ppb
O3
0.49ppb
SO2
1.68ppb
NO2
0.10ppm
CO
AQI 31
Good
2.71μg/m³
PM2.5
7.87μg/m³
PM10
33.26ppb
O3
0.50ppb
SO2
1.68ppb
NO2
0.10ppm
CO
AQI 31
Good
2.32μg/m³
PM2.5
10.71μg/m³
PM10
33.96ppb
O3
0.59ppb
SO2
1.72ppb
NO2
0.10ppm
CO
AQI 31
Good
2.48μg/m³
PM2.5
8.11μg/m³
PM10
33.89ppb
O3
0.57ppb
SO2
1.53ppb
NO2
0.10ppm
CO
AQI 25
Good
3.51μg/m³
PM2.5
9.41μg/m³
PM10
26.86ppb
O3
0.47ppb
SO2
1.72ppb
NO2
0.11ppm
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 Danbury, Connecticut is updated every hour for accuracy.
In the past 24 hours, the air quality in Danbury, Connecticut was at its worst at 06:00:00 on 2025-11-01.
In the last 24 hours, the best air quality in Danbury, Connecticut was observed at 03:00:00 on 2025-10-31.
As of now, the AQI in Danbury, Connecticut is 31, indicating Good conditions.
Danbury, Connecticut air has the highest levels of O3.
Poor air quality in Danbury, Connecticut means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Danbury, Connecticut are currently 2.701 μg/m3.
The PM10 concentration in Danbury, Connecticut is 7.027 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Danbury, Connecticut is 0.115 ppm.
Currently, Danbury, Connecticut has a sulfur dioxide (SO2) concentration of 0.439 ppb.
The current ozone (O3) level in Danbury, Connecticut at the moment is 33.467 ppm.
Nitrogen dioxide (NO2) level in Danbury, Connecticut at the moment is 1.759 ppb.
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