Air Quality in Johnstown, United States
Drizzle
26.8°C · 58.6% humidity
26.8°
Feels 26.8°
26
Good
Air quality is satisfactory. Enjoy outdoor activities.
Model forecast
Nearby Monitoring Stations
Johnstown's air quality — share it
AQI Forecast
24
9am
24
24
26
12pm
24
24
24
3pm
24
24
24
6pm
25
25
25
9pm
25
25
25
12am
25
25
25
3am
25
25
25
6am
25
25
Air Quality Index Trend
37h · 2 stnJohnstown'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 Johnstown is 1.2× the WHO annual guideline of 5 µg/m³.
58.6%
Humidity
71.2 km/h
Wind WSW
1016.5 hPa
Pressure
17.4
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
6.15 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Johnstown?
Temperature & Precipitation
PM2.5 Trend
37h · 2 stationsPM2.56.15 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX17.4
Extreme
What is the 7-day forecast for Johnstown?
05-29
26.8° 3.1°
0.25 mm
05-30
19.8° 13.3°
5.94 mm
05-31
27.2° 4.4°
06-01
30.7° 10.4°
06-02
19.8° 6.3°
06-03
23.9° 19.2°
15.62 mm
06-04
22.0° 17.9°
0.38 mm
Both models agree
Avg diff: 4.5°C
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-05-29T16:07 UTC.