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General Instructions, Forms & Help


Instructions, References and Help for Completing an Oklahoma Emissions Inventory

  General Instructions and Help Documents
  Reference Tables and Resources
  Blank Turn Around Document Forms
  Useful External Links

What is a “Turn Around” document?
This is the name given to the set of forms that are required by DEQ to be used when completing an annual emissions inventory. They can be in a hardcopy format or submitted electronically over the web using the Redbud application.

A Turn Around document contains the annual emissions inventory for a particular facility, as well as other relevant information such as the facility location and address, ownership details, operating hours and process rates, etc. Certification by the Responsible Official for the facility that the information is "...true, accurate, and complete," followed by submission of this form to DEQ, constitutes fulfillment of the legal requirements for reporting Oklahoma emissions inventories.

When completing a Turn Around Document, the Emissions Inventory General Instructions and the Emissions Inventory Frequently Asked Questions (FAQs), and the Emissions Reporting Updates and Guidance should be of the most immediate help.

Below are links to the various tables that can be referred to when completing an Emissions Inventory, as well as to blank Turn Around Document forms. Finally, there are links to external sites that may be of assistance.

If you need further help or have a question that cannot be answered by the information available here, then please contact the Emissions Inventory Section.

Instructions and Help Documents

Emissions Inventory General Instructions Updated


Gives a complete overview of what is required for Oklahoma emissions inventories, including descriptions of the individual data fields that need to be filled out in the Turn Around Document.

Redbud Help Updated


Contains specific instructions and advice (including screen grabs) for using the DEQ web-based application, Redbud, to submit emissions inventories electronically.

Emissions Reporting Updates and Guidance


The Emissions Inventory Section produces a PDF which summarizes changes and topics of interest prior to the start of the new emissions inventory reporting season.

CY2018 Emissions Reporting Updates

CY2017 Emissions Reporting Updates

CY2016 Emissions Reporting Updates

CY2015 Emissions Reporting Updates

CY2014 Emissions Reporting Updates

Emissions Inventory Frequently Asked Questions (FAQs)


These are different examples of the questions we receive throughout the year, and your questions may be quickly answered here.

However, if you have a specific question about a particular set of circumstances at your facility, then we strongly recommend that you contact us. Of course, with any question or in any situation, the Air Quality Rules always apply and must always be adhered to. Subchapter 5 of OAC 252:100 ("Registration, Emission Inventory and Annual Operating Fees") is the main part of these rules that directly govern the submitting of Emissions Inventories.

Emissions Inventory Reference Tables and Resources

Control Descriptions


Types of control equipment used to reduce emissions from a process.

Designation of Responsible Official Form  (MS Word)  (PDF)

Emission Unit Types


General categories and groups of emission unit types

Material Description

A list of materials used that created the pollutants at each process. If a particular material is not mentioned here then please contact the Emissions Inventory Section.

Methods of Calculation

Lists all the methods currently approved by DEQ for calculating emissions.

NAICS Code and Description

Lists all of the North American Industry Classification System codes and descriptions.

Permit by Rule (PBR) Reporting Changes


Effective September 10, 2013 modifications have been made in OAC 252:100-5 (Registration, Emission Inventory and Annual Operating Fees) to the emission inventory reporting requirements for all minor source facilities registered under a Permit by Rule (PBR). There have been significant changes to the reporting schedule for PBR facilities. Additional information and the amended emergency rule are available here.

Regulated Air Pollutants (RAPs)


This web page details all pollutants currently regulated in Oklahoma by State or Federal rule or regulation. Emissions of any of these pollutants must be reported as part of an emissions inventory, not just of pollutants that are specifically limited in a facility's permit.

SCC Selection


Access the EPA's SCC searchable database for assistance in selecting an appropriate SCC (Source Classification Code) to represent an emissions process or activity. Sources reporting to DEQ should limit their selections to 8 digit SCCs with a data category of "Point".

SCC 3-digit Point Source Categories


This table can be very helpful for identifying the broad category that your process falls into and thus help you focus your search for the exact SCC code for the process.

Unit Names


A list of units used to measure a process rate. These units will also be the denominator of the emission factor used to calculate emissions from a process. For example, for a natural gas boiler the process rate is measured in million standard cubic feet and the emission factor would be lbs/million standard cubic feet.

Blank Turn Around Document Forms

These forms are available in the Adobe® Portable Document Format (PDF).
If an emissions inventory for your facility was previously reported and you have elected to follow the hardcopy option for reporting emissions, then on the first working day of the year or immediately thereafter, DEQ will send you a Turn Around Document by mail or email. This will be pre-populated with most of the information about your facility. You will then need to update other key information, such as process rates and amount of pollutants emitted from your operations in the reporting year. However, if you are reporting a new emission unit and/or process, you will need to use the Blank Emission Unit Page and you may have to use the Blank Additional Pollutants Page (if you are reporting more than two pollutants from a process).

Blank Facility Main Page

Adobe Portable Document Format (.pdf)

Blank Emission Unit Page


Blank Additional Pollutants Page


Blank Certification Page


Useful External Emissions Inventory Links



AP-42 refers to the EPA’s Compilation of Air Pollutant Emission Factors, a series of representative values that attempt to relate the quantity of a pollutant released to the atmosphere from a particular activity. These factors are typically expressed as the weight of pollutant divided by a unit weight, volume, distance, or duration of the activity emitting the pollutant (e.g., lbs of carbon dioxide emitted per million standard cubic feet of natural gas burned). In most cases, emission factors in AP-42 are simply averages of all available data of acceptable quality, and are generally assumed to be representative of long-term averages for all facilities in the source category (i.e., a population average). AP-42 also gives an indication of the quality of these emission factors.



EPA's Clearinghouse for Inventories & Emissions Factors (CHIEF) is an excellent resource for all aspects of emissions inventories.



WebFIRE is EPA's online emissions factor repository, retrieval, and development tool. The WebFIRE database contains EPA's recommended emissions factors for criteria and hazardous air pollutants (HAP) for industrial and non-industrial processes.



This page has valid conversion tables between Standard Industry Classification (SIC) and North American Industrial Classification System (NAICS) codes .



Use this page to determine a Standard Industrial Classification code for a facility.

Page last updated: November 20, 2018


Redbud: Submitting Emissions Inventories on the web


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