Stay updated with real-time air quality in Thornton, Colorado 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)
43
Good
Thornton, Colorado
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
1.01 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
10.44 μg/m³
0
55
155
255
425
605+
45.67 ppb
0
55
71
86
201
201+
0.24 ppb
0
36
76
186
605
1005+
3.17 ppb
0
54
101
361
1250
2050+
0.18 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Very high
Thornton, Colorado
Thornton, Colorado
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AQI 42
Good
1.20μg/m³
PM2.5
17.57μg/m³
PM10
44.94ppb
O3
0.40ppb
SO2
2.16ppb
NO2
0.18ppm
CO
AQI 41
Good
1.21μg/m³
PM2.5
13.24μg/m³
PM10
44.29ppb
O3
0.38ppb
SO2
3.66ppb
NO2
0.17ppm
CO
AQI 41
Good
1.21μg/m³
PM2.5
12.86μg/m³
PM10
44.27ppb
O3
0.37ppb
SO2
3.83ppb
NO2
0.16ppm
CO
AQI 41
Good
1.22μg/m³
PM2.5
11.87μg/m³
PM10
44.18ppb
O3
0.37ppb
SO2
4.28ppb
NO2
0.15ppm
CO
AQI 41
Good
1.18μg/m³
PM2.5
10.00μg/m³
PM10
43.90ppb
O3
0.36ppb
SO2
4.65ppb
NO2
0.15ppm
CO
AQI 42
Good
1.22μg/m³
PM2.5
16.19μg/m³
PM10
44.66ppb
O3
0.39ppb
SO2
2.64ppb
NO2
0.17ppm
CO
Air quality and pollutant data for Colorado, 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 Thornton, Colorado is updated every hour for accuracy.
In the past 24 hours, the air quality in Thornton, Colorado was at its worst at 04:00:00 on 2026-04-23.
In the last 24 hours, the best air quality in Thornton, Colorado was observed at 11:00:00 on 2026-04-23.
As of now, the AQI in Thornton, Colorado is 43, indicating Good conditions.
Thornton, Colorado air has the highest levels of O3.
Poor air quality in Thornton, Colorado means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Thornton, Colorado are currently 1.011 μg/m3.
The PM10 concentration in Thornton, Colorado is 10.438 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Thornton, Colorado is 0.179 ppm.
Currently, Thornton, Colorado has a sulfur dioxide (SO2) concentration of 0.236 ppb.
The current ozone (O3) level in Thornton, Colorado at the moment is 45.668 ppm.
Nitrogen dioxide (NO2) level in Thornton, Colorado at the moment is 3.171 ppb.
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