Air Quality in Johnston, United States

Clear
24.4°C · 47.8% humidity
24.4°
Feels 24.4°
78
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
1 station

Nearby Monitoring Stations

AQI Forecast
24 4pm
24
24
78 7pm
63
53
45 10pm
39
35
32 1am
30
29
28 4am
27
26
26 7am
25
26
25 10am
25
25
25 1pm
25
25
AD 728×90

Air Quality Index Trend

42h · 1 stn

Johnston's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in Johnston is 1.7× the WHO 24-hour guideline of 15 µg/m³.

47.8%
Humidity
3.0 km/h
Wind S
1011.4 hPa
Pressure
1.4
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
78
24.9 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Johnston?

Temperature & Precipitation

PM2.5 Trend

42h · 1 station
PM2.524.9 µg/m³ ×1.7 WHO
Moderate
PM1013.7 µg/m³
Good
UV INDEX1.4
Low
AD 300×250
Station readings (1 station within 25 km)
24.9
Median
24.9
Average
24.9
Low
24.9
High
PM2.5 µg/m³ · Model: 5.9 · Bias: -19.0

What is the 7-day forecast for Johnston?

06-09
30.2° 15.9°
06-10
26.1° 18.7°
1.75 mm
06-11
27.6° 19.9°
06-12
29.5° 21.0°
2.63 mm
06-13
26.7° 23.3°
2.87 mm
06-14
29.7° 9.2°
22.5 mm
06-15
29.4° 23.2°
0.19 mm
Both models agree Avg diff: 5.6°C

Where are air quality stations near Johnston?

46
Carpenter, Des Moines, Iowa, USA
9.0 km PM2.5: 11.0 µg/m³
41
Carpenter, Des Moines, Iowa, USA
9.0 km PM2.5: 9.8 µg/m³

What cities are near Johnston?

78 Urbandale 78 Clive 78 Ankeny 78 West Des Moines 78 Des Moines 78 Waukee 78 Altoona 37 Indianola 37 Ames 36 Marshalltown
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-06-09T00:40 UTC.