Box Elder
Cache
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Utah
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Weber
September 14, 2026 9:00 PM (updated hourly)
PM 2.5
4.5 µg/m3Ozone
0.04 ppmTemperature
64° FWind
NW 2.4 mphAs with temperature, air pollution varies throughout the day.
Phone forecasts for all counties 801-536-0072 or toll-free 1-800-228-5434.
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The data displayed on this page represents the current air pollution levels and meteorological values, and is not quality assured. For quality assured data please visit https://www.epa.gov/outdoor-air-quality-data.
Particulate matter (PM), also known as particle pollution, is a complex mixture of extremely small dust and soot particles. For more information visit Air Pollutants: Particulate Matter.
Ozone (O3) is formed when hydrocarbons and nitrogen oxides chemically react in the presence of sunlight and heat. For more information visit Air Pollutants: Ozone.
| Action Forecast |
|---|
Unrestricted Action |
Voluntary Action |
Mandatory Action |
| Health Forecast | |||
|---|---|---|---|
| Air Quality Index (AQI) | Ozone | PM 2.5 | PM 10 |
| Good | 0 - 0.054 ppm | 0 - 9.0 µg/m3 | 0 - 54.0 µg/m3 |
| Moderate | 0.055 - 0.070 ppm | 9.1 - 35.4 µg/m3 | 54.1 - 154.0 µg/m3 |
| Unhealthy for Sensitive Groups | 0.071 - 0.085 ppm | 35.5 - 55.4 µg/m3 | 154.1 - 254.0 µg/m3 |
| Unhealthy | 0.086 - 0.105 ppm | 55.5 - 125.4 µg/m3 | 254.1 - 354.0 µg/m3 |
| Very Unhealthy | 0.106 - 0.200 ppm | 125.5 - 225.4 µg/m3 | 354.1 - 424.0 µg/m3 |
| Hazardous | Above 0.201 ppm | Above 225.5 µg/m3 | Above 424.1 µg/m3 |
| Based on an 8-hour average. | Based on a 24-hour average. | Based on a 24-hour average. | |
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