Air Quality in Affton, United States

Windy
25.6°C · 47.5% humidity
25.6°
Feels 25.6°
47
Good
Air quality is satisfactory. Enjoy outdoor activities.
3 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
27 5pm
27
27
47 8pm
41
37
34 11pm
32
31
30 2am
29
28
28 5am
28
28
27 8am
27
27
27 11am
27
27
27 2pm
27
27
Station readings 47h ago
AQI 27
PM2.5 6.5 µg/m³ · 47h ago
AD 728×90

Air Quality Index Trend

35h · 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.

47.5%
Humidity
56.4 km/h
Wind NE
1017.7 hPa
Pressure
5.9
UV High
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
47
11.24 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for Affton?

Temperature & Precipitation

PM2.5 Trend

35h · 6 stations
PM2.511.24 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX5.9
High
AD 300×250
Station readings (3 stations within 25 km)
11.24
Median
11.7
Average
9.6
Low
13.5
High
PM2.5 µg/m³ · Model: 10.85 · Bias: -0.4

What is the 7-day forecast for Affton?

08-03
30.4° 20.9°
08-04
35.9° 19.3°
08-05
36.1° 16.1°
25.81 mm
08-06
40.2° 20.5°
3.5 mm
08-07
33.4° 21.2°
08-08
37.5° 25.9°
1.44 mm
08-09
35.3° 28.0°
Both models agree Avg diff: 3.4°C

Where are air quality stations near Affton?

52
Forest Park, Missouri, USA
10.0 km PM2.5: 12.6 µg/m³
55
Ladue, Missouri, USA
11.2 km PM2.5: 14.0 µg/m³
9
Ladue, Missouri, USA
11.2 km PM2.5: 2.2 µg/m³
41
Arnold West, Missouri, USA
12.7 km PM2.5: 9.8 µg/m³
43
East St. Louis, Illinois, USA
16.5 km PM2.5: 10.3 µg/m³
50
Blair Street, Missouri, USA
16.6 km PM2.5: 12.0 µg/m³

What cities are near Affton?

48 Concord 49 Mehlville 49 Lemay 43 Webster Groves 44 Kirkwood 50 Oakville 40 Clayton 41 University City 42 Creve Coeur 53 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 2026-08-08T01:02 UTC.