Box Elder County—Trend Charts
                                                     Box Elder
                                                     Cache
                                                     Carbon
                                                     Davis
                                                     Duchesne
                                                     Grand
                                                     Iron
                                                     Salt Lake
                                                     Tooele
                                                     Uintah
                                                     Utah
                                                     Wasatch
                                                     Washington
                                                     Weber
                                                
                        
                                                     PM 2.5
                                                     PM 10
                                                     Ozone
                                                     Nitrogen Oxides (NO)
                                                     Carbon Monoxide (CO)
                                                     Sulfur Dioxide (SO2)
                                                     Temperature
                                                     Relative Humidity
                                                     Wind
                                                     Solar Radiation
                                                
                    
                                            
                    Last Updated: November 4, 2025 1:00 AM
(Data Not Quality Assured)
                        
                        
                        
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| Action Forecast | 
|---|
Unrestricted Action![]()  | 
		
Voluntary Action![]()  | 
		
Mandatory Action![]()  | 
		
| Health Forecast | ||
|---|---|---|
| Air Quality Index (AQI) | PM 2.5 | Ozone | 
| Good | 0 - 9.0 µg/m3 | 0 - 0.054 ppm | 
| Moderate | 9.1 - 35.4 µg/m3 | 0.055 - 0.070 ppm | 
| Unhealthy for Sensitive Groups | 35.5 - 55.4 µg/m3 | 0.071 - 0.085 ppm | 
| Unhealthy | 55.5 - 125.4 µg/m3 | 0.086 - 0.105 ppm | 
| Very Unhealthy | 125.5 - 225.4 µg/m3 | 0.106 - 0.200 ppm | 
| Hazardous | Above 225.5 µg/m3 | Above 0.201 ppm | 
| Based on a 24-hour average. | Based on an 8-hour average. | |
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