Air Quality in Affton, United States

Windy
31.8°C · 44.1% humidity
31.8°
Feels 34.6°
38
Good
Air quality is satisfactory. Enjoy outdoor activities.
5 stations

Nearby Monitoring Stations

AQI Forecast
25 7am
25
25
38 10am
34
32
30 1pm
28
27
27 4pm
26
26
26 7pm
34
34
34 10pm
34
34
34 1am
27
27
27 4am
25
25
AD 728×90

Air Quality Index Trend

45h · 6 stn

Affton'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 Affton is 1.8× the WHO annual guideline of 5 µg/m³.

44.1%
Humidity
42.0 km/h
Wind N
1020.0 hPa
Pressure
10.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
38
9.09 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Affton?

Temperature & Precipitation

PM2.5 Trend

45h · 6 stations
PM2.59.09 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX10.9
Extreme
AD 300×250
Station readings (5 stations within 25 km)
9.09
Median
9.78
Average
8.2
Low
15.9
High
PM2.5 µg/m³ · Model: 6.25 · Bias: -2.8

What is the 7-day forecast for Affton?

05-29
31.8° 9.5°
2.06 mm
05-30
31.4° 19.8°
1.69 mm
05-31
32.8° 13.8°
06-01
31.5° 19.0°
06-02
27.3° 16.9°
06-03
30.9° 26.0°
0.94 mm
06-04
29.6° 20.3°
3.31 mm
Both models agree Avg diff: 4.5°C

Where are air quality stations near Affton?

24
Forest Park, Missouri, USA
10.0 km PM2.5: 5.8 µg/m³
15
Arnold West, Missouri, USA
12.7 km PM2.5: 3.6 µg/m³
38
Arnold West, Missouri, USA
12.7 km PM2.5: 9.1 µg/m³
30
East St. Louis, Illinois, USA
16.5 km PM2.5: 7.2 µg/m³

What cities are near Affton?

37 Concord 38 Mehlville 39 Lemay 37 Webster Groves 37 Kirkwood 37 Oakville 36 Clayton 36 University City 37 Creve Coeur 50 St. Louis
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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 2026-05-29T15:26 UTC.