| Geography | Average Number of Days Exceeded |
|---|
Record Count: 15 |
| Cache County | 16.6 |
|---|
| Box Elder County | 3.1 |
|---|
| North Weber County | 3.7 |
|---|
| Ogden Area | 3.9 |
|---|
| Layton Area | 3.7 |
|---|
| Bountiful Area | 3.8 |
|---|
| North Salt Lake County | 12.1 |
|---|
| West Salt Lake County | 9.3 |
|---|
| Magna Area | 2.3 |
|---|
| East Salt Lake County | 16.9 |
|---|
| South Salt Lake County | 6.8 |
|---|
| Highland Area | 3.0 |
|---|
| Lindon Area | 10.4 |
|---|
| Provo Area | 3.1 |
|---|
| Spanish Fork Area | 2.9 |
|---|
Data Notes
** Data for Layton Area not available in current dataset. Averages calculated using available years which can vary depending on location.Data Source
U.S. Environmental Protection Agency, Air Quality System (AQS)
Graph Views
- Percent of Population Living in Counties Meeting the National Ambient Air Quality Standard, Utah, 2000-2021
- Percent of Days by Year, Box Elder County, 2000-2021
- Percent of Days by Year, Cache County, 2000-2021
- Percent of Days by Year, Carbon County, 2021
- Percent of Days by Year, Davis County, 2000-2021
- Percent of Days by Year, Duchesne County, 2011-2021
- Percent of Days by Year, Garfield County, 2000-2021
- Percent of Days by Year, Iron County, 2018-2021
- Percent of Days by Year, Salt Lake County, 2000-2021
- Percent of Days by Year, San Juan County, 2000-2021
- Percent of Days by Year, Tooele County, 2000-2021
- Percent of Days by Year, Uintah County, 2010-2021
- Percent of Days by Year, Utah County, 2000-2021
- Percent of Days by Year, Washington County, 2001-2021
- Percent of Days by Year, Wayne County, 2001-2021
- Percent of Days by Year, Weber County, 2000-2021
- Person-days by Year, Box Elder County, 2001-2021
- Person-days by Year, Cache County, 2000-2021
- Person-days by Year, Carbon County, 2021
- Person-days by Year, Davis County, 2000-2021
- Person-days by Year, Duchesne County, 2011-2021
- Person-days by Year, Garfield County, 2000-2021
- Person-days by Year, Iron County, 2018-2021
- Person-days by Year, Salt Lake County, 2000-2021
- Person-days by Year, San Juan County, 2000-2021
- Person-days by Year, Tooele County, 2000-2021
- Person-days by Year, Uintah County, 2010-2021
- Person-days by Year, Utah County, 2000-2021
- Person-days by Year, Washington County, 2001-2021
- Person-days by Year, Wayne County, 2001-2021
- Person-days by Year, Weber County, 2000-2021
- Average Ambient Concentrations (based on seasonal averages and daily measurement), Box Elder County, 2001-2021
- Average Ambient Concentrations (based on seasonal averages and daily measurement), Cache County, 2000-2021
- Average Ambient Concentrations (based on seasonal averages and daily measurement), Carbon County, 2021
- Average Ambient Concentrations (based on seasonal averages and daily measurement), Davis County, 2000-2021
- Average Ambient Concentrations (based on seasonal averages and daily measurement), Duchesne County, 2011-2021
- Average Ambient Concentrations (based on seasonal averages and daily measurement), Garfield County, 2000-2021
- Average Ambient Concentrations (based on seasonal averages and daily measurement), Iron County, 2018-2021
- Average Ambient Concentrations (based on seasonal averages and daily measurement), Salt Lake County, 2000-2021
- Average Ambient Concentrations (based on seasonal averages and daily measurement), San Juan County, 2000-2021
- Average Ambient Concentrations (based on seasonal averages and daily measurement), Tooele County, 2000-2021
- Average Ambient Concentrations (based on seasonal averages and daily measurement), Uintah County, 2010-2021
- Average Ambient Concentrations (based on seasonal averages and daily measurement), Utah County, 2000-2021
- Average Ambient Concentrations (based on seasonal averages and daily measurement), Washington County, 2000-2021
- Average Ambient Concentrations (based on seasonal averages and daily measurement), Wayne County, 2001-2021
- Average Ambient Concentrations (based on seasonal averages and daily measurement), Weber County, 2000-2021
- Levels Over the National Ambient Air Quality Standard: Number of Days by Year, Box Elder County, 2000-2021
- Over the National Ambient Air Quality Standard: Number of Days by Year, Cache County, 2000-2021
- Over the National Ambient Air Quality Standard: Number of Days by Year, Carbon County, 2021
- Over the National Ambient Air Quality Standard: Number of Days by Year, Davis County, 2000-2021
- Over the National Ambient Air Quality Standard: Number of Days by Year, Duchesne County, 2011-2021
- Over the National Ambient Air Quality Standard: Number of Days by Year, Garfield County, 2000-2021
- Number of Days by Year, Iron County, 2018-2021
- Over the National Ambient Air Quality Standard: Number of Days by Year, Salt Lake County, 2000-2021
- Over the National Ambient Air Quality Standard: Number of Days by Year, San Juan County, 2000-2021
- Over the National Ambient Air Quality Standard: Number of Days by Year, Tooele County, 2000-2021
- Over the National Ambient Air Quality Standard: Number of Days by Year, Uintah County, 2010-2021
- Over the National Ambient Air Quality Standard: Number of Days by Year, Utah County, 2000-2021
- Over the National Ambient Air Quality Standard: Number of Days by Year, Washington County, 2001-2021
- Over the National Ambient Air Quality Standard: Number of Days by Year, Wayne County, 2001-2021
- Over the National Ambient Air Quality Standard: Number of Days by Year, Weber County, 2000-2021
Definition
Particulate matter that measures 2.5 micrometers in diameter or less is often called PM2.5. Particulate matter 10 (PM10) measures one-seventh the width of a strand of human hair, so one can imagine just how small PM2.5 really is. PM2.5 is composed of metals, allergens, nitrates, sulfates, organic chemicals, soil, and dust that are emitted from sources such as combustion products, soot from fireplaces, and blowing dust from construction sites and agricultural activities. PM2.5 levels are generally higher during the winter months due to weather, temperature, and inversions. The United States Environmental Protection Agency (EPA) PM2.5 standard states that daily averaged PM2.5 levels should not exceed 35 micrograms per cubic meter, while annually averaged PM2.5 levels should not exceed 12 micrograms per cubic meter^1^.[[br]]
[[br]]How We Calculated the Rates
| Numerator: | This indicator report contains the following views:
# Percent of days above the National Ambient Air Quality Standards (NAAQS)
# Number of person-days above the NAAQS
# Average annual ambient concentrations of PM2.5
# Percent of population living in counties exceeding NAAQS |
| Denominator: | Where applicable, population based on U.S. Census Bureau estimates for July 1 of each year. |
Date Indicator Content Last Updated: 10/31/2022
