St. Louis air quality · Missouri, United States
Breathing through your nose filters more particles than your mouth
US AQI 81 (Moderate) in St. Louis, from 1 AirNow monitoring station. Main pollutant: PM2.5.
Updated
Pollutants in St. Louis
- PM2.581AQI
- NO₂21AQI
- PM1066AQI
- Ozone11AQI
US values are per-pollutant AQI from the highest-reading monitor near St. Louis (Granite City Gateway).
Is it safe outside in St. Louis right now?
Air quality is acceptable. People who are unusually sensitive to air pollution may feel effects with long or heavy exertion outdoors.
Walking and commuting
Go aheadFine for everyone.
Running and jogging
Take careFine for most; unusually sensitive people should ease the pace.
Cycling
Go aheadFine for everyone.
Children playing outside
Go aheadNo limits for most children.
Older adults and heart or lung conditions
Take careWatch for symptoms such as coughing or breathlessness.
Open windows
Go aheadFine to ventilate.
Mask outdoors
Not neededNot needed.
Air purifier indoors
Not neededOptional.
Based on the US EPA Air Quality Guide, applied to the current US AQI category. If you have symptoms, follow your doctor's advice.
What US AQI 51–100 means for your health →
St. Louis air quality history
Daily average, 36 days- 53average daily US AQI over 36 days
- 87worst day, 9 October
- 22cleanest day, 17 October
- 0days at Unhealthy or worse
The last 7 days averaged 43, better than the week before (68). 16 of the last 36 days were Good.
Weather in St. Louis
No active National Weather Service alerts for St. Louis.
| Day | Forecast | High | Low | Rain |
|---|---|---|---|---|
| Mon 19 | Sunny | 72°F | 46°F | 0% |
| Tue 20 | Sunny | 73°F | 46°F | 0% |
| Wed 21 | Sunny | 77°F | 50°F | 0% |
| Thu 22 | Sunny | 79°F | 52°F | 0% |
| Fri 23 | Sunny | 79°F | 52°F | 0% |
| Sat 24 | Mostly Sunny | 81°F | 54°F | 1% |
| Sun 25 | Mostly Sunny | 81°F | 54°F | 2% |
National Weather Service forecast. All US weather alerts →
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St. Louis air quality: common questions
What is the AQI in St. Louis right now?
The US AQI in St. Louis is 81 (Moderate). The main pollutant is PM2.5.
Is it safe to go outside in St. Louis today?
Fine for most people. Air quality is acceptable. People who are unusually sensitive to air pollution may feel effects with long or heavy exertion outdoors. For runners: Fine for most; unusually sensitive people should ease the pace.
How has air quality in St. Louis been recently?
Over the last 36 days with data, St. Louis averaged US AQI 53. The worst day was 9 October at 87; the cleanest was 17 October at 22. 0 days were at Unhealthy or worse.
Where does St. Louis's air quality data come from?
From US EPA AirNow, using 1 monitoring station in and around the city. Good Air does not estimate or adjust these readings.
Source: US EPA AirNow. Readings are published by the monitoring agency and may be revised.