Hourly Weather | Today › Monday, October 5, 2026
St. Louis, Missouri
8 PM
Night
66°
Feels Like 64°
0
Humidity: 44%
UV Index: 0
Wind: 5 mph
9 PM
Night
63°
Feels Like 63°
0
Humidity: 53%
UV Index: 0
Wind: 5 mph
10 PM
Night
61°
Feels Like 61°
0
Humidity: 63%
UV Index: 0
Wind: 5 mph
11 PM
Night
57°
Feels Like 55°
0
Humidity: 70%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

8 PM
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.08 µg/m³
  • PM10: 6.81 µg/m³
  • O3: 0.033 ppm
  • NO2: 2.9 ppb
  • SO2: 0.5 ppb
  • CO: 0.14 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

9 PM
28 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.52 µg/m³
  • PM10: 7.35 µg/m³
  • O3: 0.030 ppm
  • NO2: 3 ppb
  • SO2: 0.4 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 PM
29 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 6.95 µg/m³
  • PM10: 7.87 µg/m³
  • O3: 0.029 ppm
  • NO2: 2.9 ppb
  • SO2: 0.4 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM
30 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.26 µg/m³
  • PM10: 8.24 µg/m³
  • O3: 0.027 ppm
  • NO2: 2.6 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.