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Emissions Inventory


DEQ is currently working to replace Redbud, our in-house tool for reporting emissions inventories online, with the State and Local Emissions Inventory System (SLEIS) from Windsor Solutions. SLEIS is projected to be available for reporting 2019 emission inventories, which are submitted on or before April 1, 2020. Information on training will be available in the fall/winter.

Introduction to Emissions Inventory
Each year DEQ compiles a statewide Emissions Inventory. This includes emissions of air pollutants and contaminants from the following sources:

  • Point sources – Point sources are large, stationary (non-mobile), identifiable sources of emissions that release pollutants into the atmosphere. Examples include large industries, such as manufacturing plants, power plants, paper mills, refineries, etc. Such facilities are required to submit an annual Emissions Inventory of Regulated Air Pollutants either electronically or as a hard copy.

  • Area sources - Area sources collectively represent individual sources that have not been inventoried as specific point, mobile, or biogenic sources. These individual sources are typically too small, numerous, or difficult to inventory using the methods for the other classes of sources. Examples of area source categories may include oil and gas production facilities, consumer and commercial solvent use, dry cleaning, gasoline marketing and distribution, various surface coating operations, etc. Information about CenSARA's 2011 Oil & Gas Area Sources study report and emissions calculation tool is available here.

  • Mobile source (on-road and off-road) – A motor vehicle, non-road engine or non-road vehicle.

  • Biogenic sources (natural) – Biogenic emissions are all pollutants emitted from nonanthropogenic sources. Example sources include trees and vegetation, oil and gas seeps, and microbial activity.

The annual Oklahoma Emissions Inventory, which is reported to the EPA, is a resource that utilizes previous year's emissions data to evaluate emission trends. It gives support to air dispersion modeling, development of air quality rules, and air toxics risk assessment. Tracking emissions trends over time can alert the Department to potential air quality issues, which gives support to future planning. Annual summaries for reported emissions are available for download.

Developing and improving methods of electronically collecting and reporting emission inventory data is a primary goal of the Emissions Inventory Section. This work reduces the reporting burden on the regulated community and staff, increases the efficiency and effectiveness of data validation, and further assures that data quality objectives are being met. Accurate data is a key element in modeling, statistical studies, investigations, and in the State Implementation Plan (SIP) which defines DEQ’s strategy to maintain and improve air quality in Oklahoma. Continuing to increase the level of quality control also increases confidence in the accuracy and completeness of the emission inventory data.

With a more comprehensive and accurate emissions inventory program, the Department can identify and define elements of emission inventories to meet SIP requirements for complying with the 8-hour ozone National Ambient Air Quality Standard (NAAQS), the revised Particulate Matter (PM) NAAQS, and the regional haze regulations (impaired visibility). Measuring progress in reducing emissions, setting a baseline for future planning, to support possible future trading programs and to answer the public's request for information are all priorities of the Emissions Inventory Section.

Page last updated May 16, 2019  

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