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)
31
Good
Thornton, Colorado
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
2.52 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
22.66 μg/m³
0
55
155
255
425
605+
32.92 ppb
0
55
71
86
201
201+
0.35 ppb
0
36
76
186
605
1005+
5.62 ppb
0
54
101
361
1250
2050+
0.17 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Thornton, Colorado
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AQI 31
Good
2.59μg/m³
PM2.5
25.46μg/m³
PM10
32.99ppb
O3
0.31ppb
SO2
4.36ppb
NO2
0.17ppm
CO
AQI 31
Good
2.44μg/m³
PM2.5
19.90μg/m³
PM10
32.88ppb
O3
0.38ppb
SO2
6.62ppb
NO2
0.16ppm
CO
AQI 31
Good
2.44μg/m³
PM2.5
19.46μg/m³
PM10
32.83ppb
O3
0.39ppb
SO2
6.92ppb
NO2
0.16ppm
CO
AQI 31
Good
2.44μg/m³
PM2.5
18.30μg/m³
PM10
32.73ppb
O3
0.41ppb
SO2
7.78ppb
NO2
0.15ppm
CO
AQI 31
Good
2.28μg/m³
PM2.5
15.67μg/m³
PM10
32.70ppb
O3
0.44ppb
SO2
8.01ppb
NO2
0.15ppm
CO
AQI 31
Good
2.59μg/m³
PM2.5
25.15μg/m³
PM10
32.97ppb
O3
0.33ppb
SO2
5.45ppb
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 03:00:00 on 2026-03-09.
In the last 24 hours, the best air quality in Thornton, Colorado was observed at 07:00:00 on 2026-03-09.
As of now, the AQI in Thornton, Colorado is 31, 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 2.524 μg/m3.
The PM10 concentration in Thornton, Colorado is 22.665 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Thornton, Colorado is 0.168 ppm.
Currently, Thornton, Colorado has a sulfur dioxide (SO2) concentration of 0.346 ppb.
The current ozone (O3) level in Thornton, Colorado at the moment is 32.923 ppm.
Nitrogen dioxide (NO2) level in Thornton, Colorado at the moment is 5.62 ppb.
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