Air Quality in St. Louis, United States

Windy
29.8°C · 50.0% humidity
29.8°
Feels 32.7°
35
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station

Nearby Monitoring Stations

AQI Forecast
54 8am
54
54
35 11am
40
44
27 2pm
29
30
31 5pm
32
26
24 8pm
24
25
27 11pm
25
25
24 2am
24
24
24 5am
24
24
AD 728×90

Air Quality Index Trend

36h · 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.

50.0%
Humidity
44.7 km/h
Wind NE
1012.7 hPa
Pressure
19.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
35
8.4 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for St. Louis?

Temperature & Precipitation

PM2.5 Trend

36h · 1 station
PM2.58.4 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX19.9
Extreme
AD 300×250
Station readings (1 station within 25 km)
8.4
Median
8.4
Average
8.4
Low
8.4
High
PM2.5 µg/m³ · Model: 10.0 · Bias: +1.6

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

07-21
32.6° 24.2°
07-22
28.6° 22.4°
07-23
21.4° 20.4°
0.31 mm
07-24
30.3° 19.8°
0.56 mm
07-25
27.0° 20.3°
2.81 mm
07-26
33.3° 24.1°
1.25 mm
07-27
31.2° 22.7°
Both models agree Avg diff: 3.7°C

Where are air quality stations near St. Louis?

44
East St. Louis, Illinois, USA
3.7 km PM2.5: 10.6 µg/m³
30
Forest Park, Missouri, USA
7.2 km PM2.5: 7.2 µg/m³
89
Arnold West, Missouri, USA
26.4 km PM2.5: 30.2 µg/m³
56
Arnold West, Missouri, USA
26.4 km PM2.5: 14.5 µg/m³

What cities are near St. Louis?

35 East Saint Louis 35 Granite City 35 University City 35 Clayton 35 Lemay 35 Webster Groves 35 Affton 35 Ferguson 35 Overland 35 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 2026-07-21T16:54 UTC.