What is the air quality in Johnstown today?

The current Air Quality Index (AQI) in Johnstown is 17 (Good). PM2.5 concentration is 4.07 µg/m³.

What is the temperature in Johnstown right now?

The current temperature in Johnstown is 25.0°C (feels like 25.0°C). Humidity is 48.6% and wind speed is 54.7 km/h.

Is it safe to go outside in Johnstown?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 6.9 (High).

Air Quality in Johnstown, United States

Windy

25.0°C · 48.6% humidity

25.0°

Feels 25.0°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Calibrated model

Nearby Monitoring Stations

AQI Forecast

24 10am

17 1pm

22 4pm

24 7pm

27 10pm

25 1am

25 4am

27 7am

Air Quality Index Trend

43h · 2 stn

View full history →

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.

48.6%

Humidity

54.7 km/h

Wind W

1019.0 hPa

Pressure

6.9

UV High

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

4.07 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Johnstown?

Temperature & Precipitation

PM2.5 Trend

43h · 2 stations

PM2.54.07 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX6.9

High

What is the 7-day forecast for Johnstown?

09-05

25.0° 11.3°

1.0 mm

09-06

22.0° 19.9°

0.25 mm

09-07

21.8° 14.1°

1.75 mm

09-08

20.8° 13.8°

3.63 mm

09-09

21.9° 12.6°

0.19 mm

09-10

22.4° 13.9°

0.25 mm

09-11

27.1° 9.1°

Both models agree Avg diff: 5.0°C

Where are air quality stations near Johnstown?

Johnstown, Pennsylvania, USA

2.0 km PM2.5: 2.2 µg/m³

What cities are near Johnstown?

26 Altoona 17 Murrysville 17 Plum 18 Monroeville 38 Cumberland 16 McKeesport 17 Penn Hills 16 West Mifflin 17 Wilkinsburg 16 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 2026-09-05T17:02 UTC.