Air Quality in St. Louis, United States

Windy
31.8°C · 44.1% humidity
31.8°
Feels 34.6°
55
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations

Nearby Monitoring Stations

AQI Forecast
25 7am
25
25
55 10am
46
40
36 1pm
33
31
29 4pm
28
27
26 7pm
28
28
28 10pm
27
27
27 1am
27
25
25 4am
25
25
AD 728×90

Air Quality Index Trend

45h · 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. Current PM2.5 concentration in St. Louis is 2.8× the WHO annual guideline of 5 µg/m³.

44.1%
Humidity
42.0 km/h
Wind N
1020.0 hPa
Pressure
6.9
UV High
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
55
13.89 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for St. Louis?

Temperature & Precipitation

PM2.5 Trend

45h · 3 stations
PM2.513.89 µg/m³ ✓ WHO
Moderate
PM1013.7 µg/m³
Good
UV INDEX6.9
High
AD 300×250
Station readings (2 stations within 25 km)
13.89
Median
13.35
Average
7.9
Low
18.8
High
PM2.5 µg/m³ · Model: 6.25 · Bias: -7.6

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

05-29
31.8° 9.5°
2.06 mm
05-30
31.4° 19.8°
1.69 mm
05-31
32.8° 13.8°
06-01
31.5° 19.0°
06-02
27.3° 16.9°
06-03
30.9° 26.0°
0.94 mm
06-04
29.6° 20.3°
3.31 mm
Both models agree Avg diff: 4.5°C

Where are air quality stations near St. Louis?

22
East St. Louis, Illinois, USA
3.7 km PM2.5: 5.3 µg/m³
30
Forest Park, Missouri, USA
7.2 km PM2.5: 7.2 µg/m³
15
Arnold West, Missouri, USA
26.4 km PM2.5: 3.6 µg/m³
38
Arnold West, Missouri, USA
26.4 km PM2.5: 9.1 µg/m³

What cities are near St. Louis?

38 East Saint Louis 59 Granite City 54 University City 52 Clayton 41 Lemay 44 Webster Groves 40 Affton 57 Ferguson 56 Overland 36 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 2026-05-29T15:05 UTC.