What is the air quality in Johnstown today?

The current Air Quality Index (AQI) in Johnstown is 29 (Good). PM2.5 concentration is 7.0 µg/m³.

What is the temperature in Johnstown right now?

The current temperature in Johnstown is 20.9°C (feels like 20.9°C). Humidity is 87.9% and wind speed is 14.8 km/h.

Is it safe to go outside in Johnstown?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.7 (Low).

Air Quality in Johnstown, United States

Drizzle

20.9°C · 87.9% humidity

20.9°

Feels 20.9°

Good

Air quality is satisfactory. Enjoy outdoor activities.

1 station

Nearby Monitoring Stations

AQI Forecast

25 5pm

29 8pm

25 11pm

24 2am

24 5am

25 8am

25 11am

25 2pm

Air Quality Index Trend

30h · 3 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.

87.9%

Humidity

14.8 km/h

Wind E

1014.6 hPa

Pressure

0.7

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5

7.0 µg/m³

PM10▲

59.3 µg/m³

050100150200300500

What is the weather forecast for Johnstown?

Temperature & Precipitation

PM2.5 Trend

30h · 3 stations

PM2.57.0 µg/m³ ✓ WHO

Good

PM1059.3 µg/m³

Moderate

UV INDEX0.7

Low

Station readings (1 station within 25 km)

7.0

Median

7.0

Average

7.0

Low

7.0

High

PM2.5 µg/m³ · Model: 29.85 · Bias: +22.9

What is the 7-day forecast for Johnstown?

07-22

20.9° 17.2°

1.75 mm

07-23

17.7° 14.5°

2.38 mm

07-24

23.6° 11.4°

3.19 mm

07-25

21.2° 15.1°

5.31 mm

07-26

25.9° 14.0°

5.87 mm

07-27

24.7° 19.6°

0.06 mm

07-28

29.7° 18.5°

4.31 mm

Both models agree Avg diff: 2.9°C

Where are air quality stations near Johnstown?

Johnstown, Pennsylvania, USA

2.0 km PM2.5: 10.3 µg/m³

What cities are near Johnstown?

69 Altoona 34 Murrysville 32 Plum 32 Monroeville 47 Cumberland 38 McKeesport 31 Penn Hills 34 West Mifflin 30 Wilkinsburg 34 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 2026-07-22T00:55 UTC.