Air Quality in Williamsport, United States
Drizzle
22.6°C · 78.6% humidity
22.6°
Feels 22.6°
61
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Model forecast
Nearby Monitoring Stations
Williamsport's air quality — share it
AQI Forecast
25
2pm
25
25
61
5pm
51
43
38
8pm
34
32
30
11pm
28
28
27
2am
25
25
25
5am
24
24
24
8am
24
24
24
11am
25
25
Air Quality Index Trend
31h · 2 stnWilliamsport'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 Williamsport is 1.1× the WHO 24-hour guideline of 15 µg/m³.
78.6%
Humidity
12.1 km/h
Wind N
1013.8 hPa
Pressure
4.4
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
17.0 µg/m³
PM10
59.3 µg/m³
050100150200300500
What is the weather forecast for Williamsport?
Temperature & Precipitation
PM2.5 Trend
31h · 2 stationsPM2.517.0 µg/m³
×1.1 WHO
Moderate
PM1059.3 µg/m³
Moderate
UV INDEX4.4
Moderate
What is the 7-day forecast for Williamsport?
07-21
28.8° 18.7°
0.06 mm
07-22
22.6° 17.2°
3.69 mm
07-23
22.3° 16.0°
9.69 mm
07-24
23.3° 11.9°
3.0 mm
07-25
25.9° 17.1°
2.56 mm
07-26
26.6° 15.0°
6.0 mm
07-27
26.3° 19.6°
Both models agree
Avg diff: 2.6°C
Where are air quality stations near Williamsport?
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-07-21T21:29 UTC.