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)
36
Good
Thornton, Colorado
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
1.04 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
4.20 μg/m³
0
55
155
255
425
605+
39.41 ppb
0
55
71
86
201
201+
0.12 ppb
0
36
76
186
605
1005+
2.23 ppb
0
54
101
361
1250
2050+
0.20 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Thornton, Colorado
Thornton, Colorado
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AQI 35
Good
1.01μg/m³
PM2.5
4.05μg/m³
PM10
38.03ppb
O3
0.19ppb
SO2
2.09ppb
NO2
0.17ppm
CO
AQI 35
Good
1.09μg/m³
PM2.5
4.50μg/m³
PM10
38.29ppb
O3
0.17ppb
SO2
3.80ppb
NO2
0.16ppm
CO
AQI 35
Good
1.10μg/m³
PM2.5
4.56μg/m³
PM10
38.28ppb
O3
0.17ppb
SO2
4.02ppb
NO2
0.16ppm
CO
AQI 35
Good
1.14μg/m³
PM2.5
4.74μg/m³
PM10
38.27ppb
O3
0.16ppb
SO2
4.62ppb
NO2
0.15ppm
CO
AQI 35
Good
1.14μg/m³
PM2.5
4.79μg/m³
PM10
38.40ppb
O3
0.15ppb
SO2
4.98ppb
NO2
0.15ppm
CO
AQI 35
Good
1.06μg/m³
PM2.5
4.26μg/m³
PM10
38.10ppb
O3
0.19ppb
SO2
2.84ppb
NO2
0.16ppm
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 07:00:00 on 2025-12-07.
In the last 24 hours, the best air quality in Thornton, Colorado was observed at 12:00:00 on 2025-12-07.
As of now, the AQI in Thornton, Colorado is 36, 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 1.042 μg/m3.
The PM10 concentration in Thornton, Colorado is 4.201 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Thornton, Colorado is 0.196 ppm.
Currently, Thornton, Colorado has a sulfur dioxide (SO2) concentration of 0.119 ppb.
The current ozone (O3) level in Thornton, Colorado at the moment is 39.41 ppm.
Nitrogen dioxide (NO2) level in Thornton, Colorado at the moment is 2.234 ppb.
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