Be the first to measure and contribute air quality data to your community
Air Quality 
Air Monitors
Air Purifiers
For Business
News
Support
Air quality in O'Fallon
Air quality index (AQI) and PM2.5 air pollution in O'Fallon
45 people follow this city
O'Fallon Air Quality Map
Real-time O'Fallon air pollution map
AIR QUALITY DATA SOURCE
* AQI modeled using satellite data Learn more
Pollen
What is the pollen count in O'Fallon today?
 | Index | Very high | |
 | Tree pollen | Very high | |
 | Grass pollen | Moderate | |
 | Weed pollen | None |
Source: tomorrow.io
Weather
What is the current weather in O'Fallon?
| Weather | Broken clouds |
| Temperature | 75.2°F |
| Humidity | 72% |
| Wind | 11.5 mp/h |
| Pressure | 29.9 Hg |
live aqi city ranking
Real-time USA city ranking
| # | city | US AQI |
|---|---|---|
| 1 |  Mecca, California | 89 |
| 2 | San Bernardino, California | 87 |
| 3 | Redlands, California | 81 |
| 4 | Yucaipa, California | 81 |
| 5 | Pasadena, Texas | 80 |
| 6 | Baytown, Texas | 79 |
| 7 | Pahrump, Nevada | 79 |
| 8 | Fontana, California | 78 |
| 9 | Boerne, Texas | 77 |
| 10 | Rancho Cucamonga, California | 77 |
(local time)
SEE WORLD AQI RANKING
3D animated air pollution map
US AQI
38*
live AQI index
Good
Overview
What is the current air quality in O'Fallon?
| Air pollution level | Air quality index | Main pollutant |
|---|---|---|
| Good | 38* US AQI | PM2.5 |
| Pollutants | Concentration | |
|---|---|---|
| PM2.5 | 7*µg/m³ | |
!
PM2.5
x1.4
PM2.5 concentration in O'Fallon is currently 1.4 times the WHO annual air quality guideline value
Health Recommendations
What is the current air quality in O'Fallon?
 | Enjoy outdoor activities |
 | Open your windows to bring clean, fresh air indoors GET A MONITOR |
Forecast
O'Fallon air quality index (AQI) forecast
| Day | Pollution level | Weather | Temperature | Wind |
|---|---|---|---|---|
| Today | Good 38 AQI US |  100% | 75.2° 62.6° |  8.9 mp/h |
| Sunday, Jun 2 | Moderate 61 AQI US  | | 80.6° 60.8° | 6.7 mp/h |
| Monday, Jun 3 | Moderate 63 AQI US | 100% | 86° 64.4° | 17.9 mp/h |
| Tuesday, Jun 4 | Moderate 55 AQI US | 70% | 86° 64.4° | 11.2 mp/h |
| Wednesday, Jun 5 | Good 50 AQI US | 100% | 78.8° 66.2° | 20.1 mp/h |
| Thursday, Jun 6 | Good 24 AQI US | | 77° 60.8° | 11.2 mp/h |
| Friday, Jun 7 | Good 13 AQI US |  | 80.6° 57.2° | 6.7 mp/h |
Interested in hourly forecast? Get the app
News
The latest air quality news and resources.
How to best protect from air pollution?
Where is the cleanest air quality in O'Fallon?
No locations are available.
AQI US, Metric