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Data List for Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Washington County, 2004-2021

YearNumber of Days Above Standard
Record Count: 18
200414
200520
200610
20075
20089
20093
20109
20116
201213
20135
20141
20153
20160
20171
20182
20190
20203
20212

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc.   [[br]] [[br]] Data are not available prior to 2004 because either there were no air monitors in the county or 8-hour averages were not collected.

Data Source

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

Graph Views

Definition

The United States Environmental Protection Agency (EPA) ozone standard states that the 8-hour average ozone level should not exceed 0.070 ppm. These standard levels are often referred to as the National Ambient Air Quality Standards (NAAQS). This level is considered protective for most people and within the normal defensive capacities of the human respiratory system.^1-3^[[br]] [[br]] ---- 1. McDonnell, et al. (1997) Prediction of ozone-induced FEV1 changes: Effects of concentration, duration and ventilation. American Journal of Respiratory and Critical Care Medicine. Vol 156, 715-722.[[br]] 2. Mudway, et.al. (2001) Differences in basal airway antioxidant concentrations are not predictive of individual responsiveness to ozone: A comparison of healthy and mild asthmatic subjects. Free Radical Biology and Medicine, Vol 31, No. 8. 962-974.[[br]] 3. Mudway, I and Kelly, F. J. (2004) An investigation of inhaled ozone dose and the magnitude of airway inflammation in healthy adults. American Journal of Respiratory and Critical Care Medicine, Vol 169, 1089-1095.

How We Calculated the Rates

Numerator:This Indicator Report contains the following variables:[[br]] 1. Number of days with maximum 8-hour average ozone concentrations above the National Ambient Air Quality Standards (NAAQS) by county[[br]] 2. Number of person-days with maximum 8-hour average ozone concentrations above the NAAQS by county
Denominator:When applicable, the population was obtained from the IBIS query system for appropriate years by county.

Date Indicator Content Last Updated: 10/28/2022


The information provided above is from the Utah Department of Health's Center for Health Data IBIS-PH web site (http://epht.health.utah.gov). The information published on this website may be reproduced without permission. Please use the following citation: " Retrieved Fri, 29 March 2024 4:53:57 from Utah Department of Health, Center for Health Data, Indicator-Based Information System for Public Health Web site: http://epht.health.utah.gov ".

Content updated: Tue, 1 Nov 2022 08:49:35 MDT