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)
38
Good
Thornton, Colorado
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
6.65 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
19.30 μg/m³
0
55
155
255
425
605+
35.28 ppb
0
55
71
86
201
201+
0.40 ppb
0
36
76
186
605
1005+
10.24 ppb
0
54
101
361
1250
2050+
0.19 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Thornton, Colorado
Thornton, Colorado
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AQI 38
Good
6.78μg/m³
PM2.5
17.38μg/m³
PM10
35.05ppb
O3
0.40ppb
SO2
9.38ppb
NO2
0.19ppm
CO
AQI 38
Good
6.52μg/m³
PM2.5
21.14μg/m³
PM10
35.51ppb
O3
0.40ppb
SO2
10.92ppb
NO2
0.20ppm
CO
AQI 33
Good
6.49μg/m³
PM2.5
21.44μg/m³
PM10
35.54ppb
O3
0.41ppb
SO2
11.20ppb
NO2
0.20ppm
CO
AQI 33
Good
6.42μg/m³
PM2.5
22.28μg/m³
PM10
35.63ppb
O3
0.41ppb
SO2
11.88ppb
NO2
0.20ppm
CO
AQI 33
Good
6.30μg/m³
PM2.5
23.82μg/m³
PM10
35.84ppb
O3
0.41ppb
SO2
12.14ppb
NO2
0.20ppm
CO
AQI 38
Good
6.66μg/m³
PM2.5
17.90μg/m³
PM10
35.00ppb
O3
0.40ppb
SO2
10.17ppb
NO2
0.19ppm
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 2026-05-21.
In the last 24 hours, the best air quality in Thornton, Colorado was observed at 02:00:00 on 2026-05-20.
As of now, the AQI in Thornton, Colorado is 38, indicating Good conditions.
Thornton, Colorado air has the highest levels of PM2.5.
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 6.646 μg/m3.
The PM10 concentration in Thornton, Colorado is 19.297 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Thornton, Colorado is 0.193 ppm.
Currently, Thornton, Colorado has a sulfur dioxide (SO2) concentration of 0.402 ppb.
The current ozone (O3) level in Thornton, Colorado at the moment is 35.281 ppm.
Nitrogen dioxide (NO2) level in Thornton, Colorado at the moment is 10.241 ppb.
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