Air Quality in Norristown, United States

Partly Cloudy
23.0°C · 54.3% humidity
23.0°
Feels 23.0°
51
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
47 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
49 3pm
49
49
51 6pm
49
49
49 9pm
49
49
49 12am
49
49
49 3am
49
49
49 6am
49
49
47 9am
47
47
47 12pm
47
47
Station readings
59
67
31
CAMS model adj +22
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
25
25
25
25
25
25
AD 728×90

Air Quality Index Trend

47h · 1 stn

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

54.3%
Humidity
39.3 km/h
Wind ENE
1014.3 hPa
Pressure
1.4
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
51
12.14 µg/m³
PM10
31
34.3 µg/m³
050100150200300500

What is the weather forecast for Norristown?

Temperature & Precipitation

PM2.5 Trend

47h · 1 station
PM2.512.14 µg/m³ ✓ WHO
Moderate
PM1034.3 µg/m³
Good
UV INDEX1.4
Low
AD 300×250
Station readings (47 stations within 25 km)
12.14
Median
12.23
Average
10.2
Low
13.56
High
PM2.5 µg/m³ · Model: 16.8 · Bias: +4.7

What is the 7-day forecast for Norristown?

07-21
28.8° 20.0°
0.06 mm
07-22
24.8° 18.9°
1.06 mm
07-23
28.9° 17.7°
16.06 mm
07-24
26.1° 18.7°
1.06 mm
07-25
31.3° 21.0°
6.31 mm
07-26
24.8° 19.2°
6.69 mm
07-27
26.6° 22.9°
0.44 mm
Both models agree Avg diff: 2.6°C

Where are air quality stations near Norristown?

30
Norristown, Pennsylvania, USA
2.8 km PM2.5: 7.2 µg/m³
50
C077 ( 945 Manatawna Ave)
10.4 km PM2.5: 11.9 µg/m³
48
AMS ROX Station
11.6 km PM2.5: 11.6 µg/m³
54
8701 Germantown Ave
12.2 km PM2.5: 13.4 µg/m³
52
723 Wolcott Dr (2)
13.1 km PM2.5: 12.8 µg/m³
42
6237 Ridge Ave
14.1 km PM2.5: 10.2 µg/m³
52
629 E Allen Ln
14.6 km PM2.5: 12.4 µg/m³
50
6735 Germantown Ave
15.1 km PM2.5: 12.0 µg/m³
45
5029 Ridge ave
16.0 km PM2.5: 10.9 µg/m³
43
C029 (5400 Lincoln Hwy)
16.5 km PM2.5: 10.3 µg/m³

What cities are near Norristown?

51 King of Prussia 51 Radnor 48 Lansdale 52 East Mount Airy 49 Phoenixville 50 Havertown 52 West Oak Lane 46 Overbrook 51 Abington 52 Logan
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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 2026-07-21T22:04 UTC.