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)
35
Good
Thornton, Colorado
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
4.85 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
24.68 μg/m³
0
55
155
255
425
605+
37.80 ppb
0
55
71
86
201
201+
0.58 ppb
0
36
76
186
605
1005+
14.82 ppb
0
54
101
361
1250
2050+
0.32 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
High
Thornton, Colorado
Thornton, Colorado
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AQI 29
Good
4.50μg/m³
PM2.5
30.64μg/m³
PM10
30.15ppb
O3
0.59ppb
SO2
5.53ppb
NO2
0.27ppm
CO
AQI 30
Good
4.46μg/m³
PM2.5
27.03μg/m³
PM10
31.66ppb
O3
0.54ppb
SO2
11.17ppb
NO2
0.25ppm
CO
AQI 30
Good
4.46μg/m³
PM2.5
26.74μg/m³
PM10
31.80ppb
O3
0.52ppb
SO2
11.94ppb
NO2
0.24ppm
CO
AQI 30
Good
4.48μg/m³
PM2.5
25.97μg/m³
PM10
32.16ppb
O3
0.49ppb
SO2
14.00ppb
NO2
0.23ppm
CO
AQI 31
Good
4.41μg/m³
PM2.5
24.44μg/m³
PM10
32.81ppb
O3
0.47ppb
SO2
15.03ppb
NO2
0.22ppm
CO
AQI 29
Good
4.50μg/m³
PM2.5
29.56μg/m³
PM10
30.71ppb
O3
0.57ppb
SO2
7.63ppb
NO2
0.26ppm
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 08:00:00 on 2026-06-07.
In the last 24 hours, the best air quality in Thornton, Colorado was observed at 10:00:00 on 2026-06-08.
As of now, the AQI in Thornton, Colorado is 35, 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 4.852 μg/m3.
The PM10 concentration in Thornton, Colorado is 24.68 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Thornton, Colorado is 0.322 ppm.
Currently, Thornton, Colorado has a sulfur dioxide (SO2) concentration of 0.579 ppb.
The current ozone (O3) level in Thornton, Colorado at the moment is 37.798 ppm.
Nitrogen dioxide (NO2) level in Thornton, Colorado at the moment is 14.817 ppb.
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