Stay updated with real-time air quality in Johnston, Iowa 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)
49
Good
Johnston, Iowa
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
9.04 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
40.07 μg/m³
0
55
155
255
425
605+
42.56 ppb
0
55
71
86
201
201+
0.53 ppb
0
36
76
186
605
1005+
2.20 ppb
0
54
101
361
1250
2050+
0.16 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Johnston, Iowa
Johnston, Iowa
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AQI 52
Moderate
10.02μg/m³
PM2.5
46.99μg/m³
PM10
35.67ppb
O3
0.58ppb
SO2
2.92ppb
NO2
0.15ppm
CO
AQI 52
Moderate
9.59μg/m³
PM2.5
35.47μg/m³
PM10
34.39ppb
O3
0.57ppb
SO2
2.92ppb
NO2
0.15ppm
CO
AQI 52
Moderate
10.24μg/m³
PM2.5
46.83μg/m³
PM10
34.39ppb
O3
0.57ppb
SO2
2.91ppb
NO2
0.15ppm
CO
AQI 49
Good
8.50μg/m³
PM2.5
38.03μg/m³
PM10
35.18ppb
O3
0.56ppb
SO2
2.75ppb
NO2
0.16ppm
CO
AQI 54
Moderate
11.42μg/m³
PM2.5
51.42μg/m³
PM10
35.06ppb
O3
0.57ppb
SO2
2.87ppb
NO2
0.15ppm
CO
AQI 52
Moderate
10.21μg/m³
PM2.5
49.03μg/m³
PM10
34.69ppb
O3
0.58ppb
SO2
2.91ppb
NO2
0.15ppm
CO
Air quality and pollutant data for Iowa, 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 Johnston, Iowa is updated every hour for accuracy.
In the past 24 hours, the air quality in Johnston, Iowa was at its worst at 04:00:00 on 2026-07-11.
In the last 24 hours, the best air quality in Johnston, Iowa was observed at 12:00:00 on 2026-07-11.
As of now, the AQI in Johnston, Iowa is 49, indicating Good conditions.
Johnston, Iowa air has the highest levels of PM2.5.
Poor air quality in Johnston, Iowa means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Johnston, Iowa are currently 9.037 μg/m3.
The PM10 concentration in Johnston, Iowa is 40.067 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Johnston, Iowa is 0.158 ppm.
Currently, Johnston, Iowa has a sulfur dioxide (SO2) concentration of 0.526 ppb.
The current ozone (O3) level in Johnston, Iowa at the moment is 42.564 ppm.
Nitrogen dioxide (NO2) level in Johnston, Iowa at the moment is 2.201 ppb.
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