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Data List for PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Carbon County, 2021

YearPercent of Days Sampled Over NAAQS
Record Count: 1
20215.0%

Data Notes

Percent reflects the percent of days sampled in the county during the year, not total days of the year.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

Graph Views

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


The information provided above is from the Utah Department of Health and Human Services IBIS-PH web site (http://ibis.health.state.gov). The information published on this website may be reproduced without permission. Please use the following citation: " Retrieved Thu, 28 March 2024 17:18:07 from Utah Department of Health and Human Services, Indicator-Based Information System for Public Health Web site: http://ibis.health.state.gov ".

Content updated: Tue, 1 Nov 2022 08:49:55 MDT