Air Quality in St. Louis, United States

Windy
25.6°C · 47.5% humidity
25.6°
Feels 25.6°
53
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
62 3pm
62
62
53 6pm
56
57
59 9pm
60
40
41 12am
41
41
42 3am
42
42
42 6am
42
42
62 9am
62
62
62 12pm
62
42
Station readings 45h ago
AQI 42
PM2.5 10.1 µg/m³ · 45h ago
AD 728×90

Air Quality Index Trend

37h · 3 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.

47.5%
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▲
53
13.23 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for St. Louis?

Temperature & Precipitation

PM2.5 Trend

37h · 3 stations
PM2.513.23 µg/m³ ✓ WHO
Moderate
PM1020.55 µg/m³
Good
UV INDEX5.9
High
AD 300×250
Station readings (2 stations within 25 km)
13.23
Median
11.55
Average
9.6
Low
13.5
High
PM2.5 µg/m³ · Model: 10.85 · Bias: -2.4

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

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 St. Louis?

47
Blair Street, Missouri, USA
3.2 km PM2.5: 11.3 µg/m³
50
East St. Louis, Illinois, USA
3.7 km PM2.5: 12.0 µg/m³
46
Forest Park, Missouri, USA
7.2 km PM2.5: 11.0 µg/m³
55
Ladue, Missouri, USA
13.5 km PM2.5: 14.0 µg/m³
49
Ladue, Missouri, USA
13.5 km PM2.5: 11.8 µg/m³
45
Arnold West, Missouri, USA
26.4 km PM2.5: 10.8 µg/m³

What cities are near St. Louis?

54 East Saint Louis 52 Granite City 41 University City 40 Clayton 49 Lemay 43 Webster Groves 47 Affton 44 Ferguson 41 Overland 49 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 2026-08-07T23:59 UTC.