Air Quality in St. Louis, United States

Windy
12.3°C · 47.4% humidity
12.3°
Feels 12.3°
54
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations

Nearby Monitoring Stations

AQI Forecast
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Air Quality Index Trend

37h · 1 stn

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

47.4%
Humidity
92.2 km/h
Wind N
1025.4 hPa
Pressure
0.0
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
54
13.35 µg/m³
PM10
25
27.4 µg/m³
050100150200300500

What is the weather forecast for St. Louis?

Temperature & Precipitation

PM2.5 Trend

37h · 1 station
PM2.513.35 µg/m³ ✓ WHO
Moderate
PM1027.4 µg/m³
Good
UV INDEX0.0
Low
Station readings (2 stations within 25 km)
13.35
Median
9.5
Average
3.6
Low
15.4
High
PM2.5 µg/m³ · Model: 13.5 · Bias: +0.2

What is the 7-day forecast for St. Louis?

10-20
15.9° 4.7°
0.06 mm
10-21
24.8° 14.8°
5.62 mm
10-22
22.0° 11.2°
2.56 mm
10-23
13.9° 10.5°
9.31 mm
10-24
27.7° 13.9°
10-25
19.2° 4.6°
10-26
25.8° 6.3°
0.06 mm
Both models agree Avg diff: 4.4°C

Where are air quality stations near St. Louis?

46
Branch Street, Missouri, USA
3.3 km PM2.5: 11.0 µg/m³
13
Forest Park, Missouri, USA
7.2 km PM2.5: 3.1 µg/m³
40
Arnold West, Missouri, USA
26.4 km PM2.5: 9.6 µg/m³

What cities are near St. Louis?

54 East Saint Louis 54 Granite City 21 University City 20 Clayton 33 Lemay 27 Webster Groves 32 Affton 38 Ferguson 30 Overland 37 Mehlville
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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 2026-10-20T20:06 UTC.