UDAQ is currently developing 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 draft documents and are subject to change. Contact Ryan …
Read MoreThe development of an Ozone SIP is very much an iterative process. The technical foundation of any SIP involves numerous emissions inventories, air quality modeling assumptions, potential emission controls, and ever-fluctuating design values recorded throughout the air monitoring network. The rules for developing an ozone SIP provided by the EPA, known as the Ozone Implementation …
Read MoreOzone Overview Ozone is a colorless gas comprised of three oxygen atoms. It is not emitted directly into the air as a gas but is formed through a chemical reaction between nitrogen oxides (NOx) and volatile organic compounds (VOCs) in the presence of sunlight. While the ozone protects the earth from harmful ultraviolet radiation in …
Read MoreOverview Within two years after setting or revising NAAQS for criteria pollutants, the EPA must designate areas as meeting (attainment) or not meeting (nonattainment) the air-quality standard. The EPA’s final designations are based on the most recent three years of air-quality monitoring data, recommendations from the state, and additional technical information. State recommendations are made …
Read MoreRACT 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 …
Read MoreRACM 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 …
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Executive Director’s Office