Stay updated with real-time air quality in Johnstown, 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)
32
Good
Johnstown, Colorado
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
3.40 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
30.43 μg/m³
0
55
155
255
425
605+
35.16 ppb
0
55
71
86
201
201+
0.83 ppb
0
36
76
186
605
1005+
6.11 ppb
0
54
101
361
1250
2050+
0.13 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Johnstown, Colorado
Johnstown, Colorado
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AQI 38
Good
3.32μg/m³
PM2.5
19.79μg/m³
PM10
40.66ppb
O3
0.83ppb
SO2
3.04ppb
NO2
0.13ppm
CO
AQI 41
Good
3.50μg/m³
PM2.5
22.07μg/m³
PM10
43.62ppb
O3
0.84ppb
SO2
2.49ppb
NO2
0.12ppm
CO
AQI 39
Good
3.43μg/m³
PM2.5
17.75μg/m³
PM10
42.31ppb
O3
0.85ppb
SO2
1.21ppb
NO2
0.11ppm
CO
AQI 35
Good
3.25μg/m³
PM2.5
20.70μg/m³
PM10
37.66ppb
O3
0.84ppb
SO2
6.18ppb
NO2
0.11ppm
CO
AQI 32
Good
3.11μg/m³
PM2.5
14.60μg/m³
PM10
35.35ppb
O3
0.84ppb
SO2
6.00ppb
NO2
0.11ppm
CO
AQI 38
Good
3.38μg/m³
PM2.5
18.33μg/m³
PM10
41.23ppb
O3
0.85ppb
SO2
2.36ppb
NO2
0.11ppm
CO
Air quality data and pollutant measurements for Colorado, USA adhere to strict US EPA standards. The data is collected from multiple reliable sources, including satellites and ground-based monitoring stations. This data is further analyzed and enhanced using machine learning and advanced algorithms that factor in elements such as traffic and population density, ensuring accurate and reliable results.
Source: Ambee Data Sources
The air quality for Johnstown, Colorado is updated every hour.
The worst air quality in Johnstown, Colorado in the last 24 hours was observed at 03:00:00 on 2026-06-08.
In the last 24 hrs, the best air quality in Johnstown, Colorado was observed at 12:00:00 on 2026-06-07.
The current air quality in Johnstown, Colorado is 32, categorized as Good based on real-time data.
The most common pollutant in Johnstown, Colorado is O3.
If the air quality in Johnstown, Colorado is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at Johnstown, Colorado is 3.405 μg/m3.
The current PM10 concentration at Johnstown, Colorado is 30.432 μg/m3.
The current carbon monoxide (CO) concentration at Johnstown, Colorado is 0.128 ppm.
The current sulfur dioxide (SO2) concentration at Johnstown, Colorado is 0.83 ppb.
The current ozone (O3) concentration at Johnstown, Colorado is 35.162 ppm.
The current nitrogen dioxide (NO2) concentration at Johnstown, Colorado is 6.108 ppb.
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