Stay updated with real-time air quality in Highlands Ranch, 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)
34
Good
Highlands Ranch, Colorado
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
1.73 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
9.14 μg/m³
0
55
155
255
425
605+
37.41 ppb
0
55
71
86
201
201+
0.47 ppb
0
36
76
186
605
1005+
9.99 ppb
0
54
101
361
1250
2050+
0.20 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Highlands Ranch, Colorado
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AQI 34
Good
1.75μg/m³
PM2.5
11.08μg/m³
PM10
37.41ppb
O3
0.47ppb
SO2
10.23ppb
NO2
0.20ppm
CO
AQI 35
Good
1.75μg/m³
PM2.5
10.22μg/m³
PM10
37.60ppb
O3
0.47ppb
SO2
10.17ppb
NO2
0.20ppm
CO
AQI 37
Good
1.51μg/m³
PM2.5
6.36μg/m³
PM10
39.67ppb
O3
0.47ppb
SO2
9.63ppb
NO2
0.20ppm
CO
AQI 34
Good
1.77μg/m³
PM2.5
10.96μg/m³
PM10
37.33ppb
O3
0.47ppb
SO2
10.21ppb
NO2
0.20ppm
CO
AQI 37
Good
1.37μg/m³
PM2.5
8.58μg/m³
PM10
39.80ppb
O3
0.47ppb
SO2
9.51ppb
NO2
0.19ppm
CO
AQI 35
Good
1.67μg/m³
PM2.5
10.73μg/m³
PM10
37.65ppb
O3
0.47ppb
SO2
10.19ppb
NO2
0.20ppm
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 Highlands Ranch, Colorado is updated every hour for accuracy.
In the past 24 hours, the air quality in Highlands Ranch, Colorado was at its worst at 10:00:00 on 2026-03-08.
In the last 24 hours, the best air quality in Highlands Ranch, Colorado was observed at 04:00:00 on 2026-03-09.
As of now, the AQI in Highlands Ranch, Colorado is 34, indicating Good conditions.
Highlands Ranch, Colorado air has the highest levels of O3.
Poor air quality in Highlands Ranch, Colorado means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Highlands Ranch, Colorado are currently 1.731 μg/m3.
The PM10 concentration in Highlands Ranch, Colorado is 9.145 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Highlands Ranch, Colorado is 0.197 ppm.
Currently, Highlands Ranch, Colorado has a sulfur dioxide (SO2) concentration of 0.471 ppb.
The current ozone (O3) level in Highlands Ranch, Colorado at the moment is 37.412 ppm.
Nitrogen dioxide (NO2) level in Highlands Ranch, Colorado at the moment is 9.99 ppb.
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