Air Quality in Clayton, United States

Drizzle
19.8°C · 96.3% humidity
19.8°
Feels 19.8°
25
Good
Air quality is satisfactory. Enjoy outdoor activities.
6 stations

Nearby Monitoring Stations

AQI Forecast
54 9am
54
34
25 12pm
28
29
31 3pm
32
32
33 6pm
33
53
54 9pm
54
54
54 12am
54
34
34 3am
34
34
34 6am
54
27
AD 728×90

Air Quality Index Trend

45h · 6 stn

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

96.3%
Humidity
44.1 km/h
Wind NE
1018.9 hPa
Pressure
19.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
25
5.9 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Clayton?

Temperature & Precipitation

PM2.5 Trend

45h · 6 stations
PM2.55.9 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX19.9
Extreme
AD 300×250
Station readings (6 stations within 25 km)
5.9
Median
9.47
Average
5.0
Low
12.6
High
PM2.5 µg/m³ · Model: 8.2 · Bias: +2.3

What is the 7-day forecast for Clayton?

09-05
26.6° 19.8°
3.37 mm
09-06
38.4° 18.6°
3.06 mm
09-07
29.2° 22.6°
09-08
25.2° 21.0°
9.88 mm
09-09
24.4° 16.2°
8.12 mm
09-10
32.1° 19.3°
0.38 mm
09-11
38.3° 20.3°
0.06 mm
Both models agree Avg diff: 6.4°C

Where are air quality stations near Clayton?

21
Ladue, Missouri, USA
2.5 km PM2.5: 5.0 µg/m³
28
Forest Park, Missouri, USA
3.9 km PM2.5: 6.7 µg/m³
48
Branch Street, Missouri, USA
11.7 km PM2.5: 11.5 µg/m³
49
East St. Louis, Illinois, USA
14.6 km PM2.5: 11.8 µg/m³
52
East St. Louis, Illinois, USA
14.6 km PM2.5: 12.6 µg/m³
46
Arnold West, Missouri, USA
22.5 km PM2.5: 11.0 µg/m³
51
Arnold West, Missouri, USA
22.5 km PM2.5: 12.1 µg/m³
68
Arnold West, Missouri, USA
22.5 km PM2.5: 20.2 µg/m³
72
Arnold West, Missouri, USA
22.5 km PM2.5: 22.1 µg/m³
49
Arnold West, Missouri, USA
22.5 km PM2.5: 11.8 µg/m³

What cities are near Clayton?

27 University City 30 Webster Groves 27 Overland 27 Creve Coeur 32 Kirkwood 36 Affton 44 St. Louis 32 Ferguson 25 Maryland Heights 39 Lemay
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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 2026-09-05T17:14 UTC.