Tag: Ozone

  • Northern Wasatch Front Moderate Ozone SIP TechnicalSupport Documentation

    Utah Division of Air Quality (UDAQ) developed and submitted to EPA for review the Northern Wasatch Front (NWF) Moderate State Implementation Plan (SIP) for the 2015 8-hour ozone National Ambient Air Quality Standard. The following tabs contain the technical support documentation (TSD) pertaining to the development of the SIP and associated administrative rules. These are…

  • Northern Wasatch Front Ozone Emissions Inventory

    This page contains information about summertime ozone and an interactive inventory of ozone precursor emissions for the Northern Wasatch Front ozone nonattainment area. Use the Interactive Inventory to explore and learn about different emission sectors and sources (SCCs) within the Northern Wasatch Front. What is summertime ozone? You’re probably familiar with the Wasatch Front’s wintertime…

  • Reasonably Available Control Technology (RACT) Process Ozone SIP

    RACT Overview Under the Clean Air Act, all areas designated  as a moderate or more severe nonattainment area for the 2015 8-hour ozone standard are required to implement RACT for all existing major sources of VOCs or NOx as well as all VOC sources subject to an EPA Control Technique Guideline (CTG). For ozone nonattainment…

  • Reasonably Available Control Measures (RACM) Process Ozone SIP

    RACM Overview Under the Clean Air Act, all areas designated Moderate or more severe nonattainment areas for the 2015 8-hour ozone standard are required to implement RACM for point, area, off-road, and on-road source categories. RACM applies only to those point sources not already addressed as part of a RACT analysis. RACM implementation is required…

  • What is Ozone?

    Ozone is an odorless, colorless gas made up of three oxygen atoms (O3) and is a natural part of the environment. It occurs both in the Earth’s upper atmosphere, or stratosphere, and at ground level in the lower atmosphere, or troposphere. Approximately 90 percent of atmospheric ozone is located in the stratosphere, which begins about…

  • Check Daily Air Quality Forecast to Plan Ahead & Protect Health

    Utah DEQ provides air-quality forecasting throughout the summer through its UtahAir app, website, and regular email updates.

  • Great Salt Lake Summer Ozone Study

    DAQ (Division of Air Quality) monitoring found high levels of ozone near the Great Salt Lake from 2010-2013. The Division also found a wide variance in the concentration of ozone in the stable air pocket over the lake during the summertime. Though the mechanisms behind air flow in lake and coastal regions have been studied…

  • Chemical Mechanisms at Low Temperatures

    Wintertime ozone in the Uinta Basin is unique and requires improvements to the photochemical models used for winter conditions. Current chemical mechanisms within the modeling system assume a summertime temperature of 300 K (80° F) when performing important chemical reactions, far different from the wintertime temperatures in the Basin. In order to properly model the…

  • CAMx Snow Cover Treatment

    Wintertime ozone is a serious air quality issue in the Uinta Basin. The situation is unique and requires improvements to the photochemical models used for winter conditions. High concentrations of wintertime ozone occur over snow-covered surfaces. Snow cover influences wintertime ozone by increasing surface albedo and thus increasing photolysis rates, inhibiting the surface deposition of…

  • DEQ Forecasters Keep Their Eyes on the Sky during Ozone Season

    By Kimberly Kreykes Like many people, my day starts with the weather forecast. Not just because it is my passion, but because it is my responsibility to stay informed — I am the lead air-quality forecaster for the Utah Department of Environmental Quality’s (DEQ’s) Division of Air Quality (DAQ). Along with two other DAQ forecasters,…

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