Air Quality in Norristown, United States

Cloudy
21.3°C · 76.9% humidity
21.3°
Feels 21.3°
17
Good
Air quality is satisfactory. Enjoy outdoor activities.
47 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
7 2am
7
7
17 5am
14
12
11 8am
17
16
15 11am
15
35
34 2pm
14
14
14 5pm
14
7
7 8pm
14
14
14 11pm
34
14
Station readings
6
5
8
8
CAMS model adj -20
27
27
27
27
27
27
27
34
34
34
34
54
54
34
34
34
34
27
27
34
34
34
54
34
AD 728×90

Air Quality Index Trend

38h · 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.

76.9%
Humidity
25.0 km/h
Wind SSW
1015.3 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
17
4.05 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Norristown?

Temperature & Precipitation

PM2.5 Trend

38h · 1 station
PM2.54.05 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
Station readings (47 stations within 25 km)
4.05
Median
4.04
Average
3.71
Low
4.79
High
PM2.5 µg/m³ · Model: 6.25 · Bias: +2.2

What is the 7-day forecast for Norristown?

06-09
32.2° 12.1°
0.19 mm
06-10
28.8° 20.0°
14.25 mm
06-11
24.2° 11.5°
06-12
22.9° 17.4°
10.56 mm
06-13
30.8° 19.3°
06-14
26.9° 17.6°
4.44 mm
06-15
24.3° 15.9°
Both models agree Avg diff: 6.0°C

Where are air quality stations near Norristown?

10
Norristown, Pennsylvania, USA
2.8 km PM2.5: 2.4 µg/m³
17
C077 ( 945 Manatawna Ave)
10.4 km PM2.5: 4.0 µg/m³
20
AMS ROX Station
11.6 km PM2.5: 4.8 µg/m³
17
8701 Germantown Ave
12.2 km PM2.5: 4.0 µg/m³
18
723 Wolcott Dr (2)
13.1 km PM2.5: 4.2 µg/m³
16
6237 Ridge Ave
14.1 km PM2.5: 3.8 µg/m³
16
629 E Allen Ln
14.6 km PM2.5: 3.8 µg/m³
16
6735 Germantown Ave
15.1 km PM2.5: 3.9 µg/m³
16
5029 Ridge ave
16.0 km PM2.5: 3.9 µg/m³
16
C029 (5400 Lincoln Hwy)
16.5 km PM2.5: 3.8 µg/m³

What cities are near Norristown?

17 King of Prussia 18 Radnor 17 Lansdale 16 East Mount Airy 18 Phoenixville 18 Havertown 17 West Oak Lane 16 Overbrook 18 Abington 17 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 2026-06-09T09:31 UTC.