What is the air quality in Johnstown today?

The current Air Quality Index (AQI) in Johnstown is 25 (Good). PM2.5 concentration is 6.08 µg/m³.

What is the temperature in Johnstown right now?

The current temperature in Johnstown is 6.9°C (feels like 3.1°C). Humidity is 92.0% and wind speed is 24.5 km/h.

Is it safe to go outside in Johnstown?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in Johnstown, United States

Overcast

6.9°C · 92.0% humidity

6.9°

Feels 3.1°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Calibrated model

Nearby Monitoring Stations

AQI Forecast

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Air Quality Index Trend

32h · 1 stn

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Johnstown's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

92.0%

Humidity

24.5 km/h

Wind ESE

1026.5 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

6.08 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Johnstown?

Temperature & Precipitation

PM2.5 Trend

32h · 1 station

PM2.56.08 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.0

Low

What is the 7-day forecast for Johnstown?

10-20

12.9° -0.8°

0.5 mm

10-21

18.1° 2.8°

10-22

19.0° 5.0°

0.31 mm

10-23

13.9° 0.2°

10.13 mm

10-24

14.0° 3.7°

10-25

10.8° 3.0°

7.25 mm

10-26

8.4° 6.6°

7.81 mm

Both models agree Avg diff: 4.3°C

What cities are near Johnstown?

36 Altoona 18 Murrysville 20 Plum 18 Monroeville 38 Cumberland 15 McKeesport 22 Penn Hills 17 West Mifflin 27 Wilkinsburg 19 Baldwin

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ModerateAQI > 50 Unhealthy for Sensitive GroupsAQI > 100 UnhealthyAQI > 150 Very UnhealthyAQI > 200

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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 2026-10-20T21:47 UTC.