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)
22
Good
Thornton, Colorado
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
4.42 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
21.33 μg/m³
0
55
155
255
425
605+
21.18 ppb
0
55
71
86
201
201+
0.23 ppb
0
36
76
186
605
1005+
7.45 ppb
0
54
101
361
1250
2050+
0.13 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Thornton, Colorado
Thornton, Colorado
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AQI 22
Good
4.40μg/m³
PM2.5
21.89μg/m³
PM10
21.87ppb
O3
0.26ppb
SO2
6.41ppb
NO2
0.14ppm
CO
AQI 22
Good
4.43μg/m³
PM2.5
20.80μg/m³
PM10
20.54ppb
O3
0.21ppb
SO2
8.42ppb
NO2
0.13ppm
CO
AQI 22
Good
4.43μg/m³
PM2.5
20.67μg/m³
PM10
20.39ppb
O3
0.21ppb
SO2
8.54ppb
NO2
0.13ppm
CO
AQI 22
Good
4.43μg/m³
PM2.5
20.36μg/m³
PM10
20.02ppb
O3
0.20ppb
SO2
8.95ppb
NO2
0.13ppm
CO
AQI 22
Good
4.44μg/m³
PM2.5
19.85μg/m³
PM10
19.46ppb
O3
0.17ppb
SO2
9.59ppb
NO2
0.12ppm
CO
AQI 22
Good
4.42μg/m³
PM2.5
21.46μg/m³
PM10
21.36ppb
O3
0.25ppb
SO2
6.92ppb
NO2
0.13ppm
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 05:00:00 on 2026-01-22.
In the last 24 hours, the best air quality in Thornton, Colorado was observed at 09:00:00 on 2026-01-23.
As of now, the AQI in Thornton, Colorado is 22, 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 4.415 μg/m3.
The PM10 concentration in Thornton, Colorado is 21.332 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Thornton, Colorado is 0.132 ppm.
Currently, Thornton, Colorado has a sulfur dioxide (SO2) concentration of 0.234 ppb.
The current ozone (O3) level in Thornton, Colorado at the moment is 21.181 ppm.
Nitrogen dioxide (NO2) level in Thornton, Colorado at the moment is 7.446 ppb.
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