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
5.09 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
9.02 μg/m³
0
55
155
255
425
605+
21.03 ppb
0
55
71
86
201
201+
0.52 ppb
0
36
76
186
605
1005+
7.05 ppb
0
54
101
361
1250
2050+
0.28 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Danbury, Connecticut
Danbury, Connecticut
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AQI 27
Good
5.00μg/m³
PM2.5
9.33μg/m³
PM10
20.98ppb
O3
0.53ppb
SO2
7.00ppb
NO2
0.28ppm
CO
AQI 27
Good
4.69μg/m³
PM2.5
10.66μg/m³
PM10
20.87ppb
O3
0.54ppb
SO2
6.85ppb
NO2
0.28ppm
CO
AQI 27
Good
4.91μg/m³
PM2.5
9.67μg/m³
PM10
20.89ppb
O3
0.53ppb
SO2
6.91ppb
NO2
0.28ppm
CO
AQI 22
Good
4.03μg/m³
PM2.5
21.36μg/m³
PM10
21.10ppb
O3
0.50ppb
SO2
6.21ppb
NO2
0.28ppm
CO
AQI 18
Good
3.19μg/m³
PM2.5
10.79μg/m³
PM10
19.25ppb
O3
0.70ppb
SO2
6.13ppb
NO2
0.29ppm
CO
AQI 22
Good
3.63μg/m³
PM2.5
16.65μg/m³
PM10
20.35ppb
O3
0.69ppb
SO2
6.16ppb
NO2
0.29ppm
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 03:00:00 on 2026-11-12.
In the last 24 hours, the best air quality in Danbury, Connecticut was observed at 06:00:00 on 2026-11-12.
As of now, the AQI in Danbury, Connecticut is 27, indicating Good conditions.
Danbury, Connecticut air has the highest levels of PM2.5.
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 5.094 μg/m3.
The PM10 concentration in Danbury, Connecticut is 9.024 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Danbury, Connecticut is 0.283 ppm.
Currently, Danbury, Connecticut has a sulfur dioxide (SO2) concentration of 0.52 ppb.
The current ozone (O3) level in Danbury, Connecticut at the moment is 21.031 ppm.
Nitrogen dioxide (NO2) level in Danbury, Connecticut at the moment is 7.054 ppb.
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