Air Quality in Norristown, United States

Windy
31.8°C · 45.9% humidity
31.8°
Feels 34.9°
28
Good
Air quality is satisfactory. Enjoy outdoor activities.
51 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
24 9am
24
24
28 12pm
24
22
22 3pm
22
22
22 6pm
22
24
31 9pm
24
24
24 12am
22
22
22 3am
22
22
22 6am
22
24
Station readings
24
20
13
CAMS model adj -3
27
27
27
27
27
25
25
25
25
25
25
27
34
27
27
27
25
25
25
25
25
25
25
27
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.

45.9%
Humidity
43.8 km/h
Wind W
1015.9 hPa
Pressure
17.4
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
28
6.72 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Norristown?

Temperature & Precipitation

PM2.5 Trend

47h · 1 station
PM2.56.72 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX17.4
Extreme
AD 300×250
Station readings (51 stations within 25 km)
6.72
Median
6.77
Average
5.7
Low
7.81
High
PM2.5 µg/m³ · Model: 6.25 · Bias: -0.5

What is the 7-day forecast for Norristown?

09-05
31.8° 14.9°
0.31 mm
09-06
23.9° 19.8°
2.81 mm
09-07
23.9° 17.9°
09-08
22.2° 18.2°
0.56 mm
09-09
26.4° 12.9°
09-10
26.5° 16.7°
6.94 mm
09-11
32.6° 12.7°
Both models agree Avg diff: 5.0°C

Where are air quality stations near Norristown?

28
C077 ( 945 Manatawna Ave)
10.4 km PM2.5: 6.7 µg/m³
29
AMS ROX Station
11.7 km PM2.5: 6.9 µg/m³
28
8701 Germantown Ave
12.2 km PM2.5: 6.7 µg/m³
26
723 Wolcott Dr (2)
13.1 km PM2.5: 6.3 µg/m³
25
6237 Ridge Ave
14.1 km PM2.5: 6.1 µg/m³
27
629 E Allen Ln
14.6 km PM2.5: 6.4 µg/m³
28
6735 Germantown Ave
15.1 km PM2.5: 6.8 µg/m³
28
5029 Ridge ave
16.0 km PM2.5: 6.6 µg/m³
28
C029 (5400 Lincoln Hwy)
16.5 km PM2.5: 6.8 µg/m³
29
6906 City Ave
16.7 km PM2.5: 6.9 µg/m³

What cities are near Norristown?

28 King of Prussia 28 Radnor 26 Lansdale 27 East Mount Airy 28 Phoenixville 29 Havertown 28 West Oak Lane 29 Overbrook 27 Abington 28 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 2026-09-05T16:33 UTC.