Air Toxics Emissions Reporting

The Oregon Department of Environmental Quality regulates over 600 toxic air contaminants, or TACs. Facilities may be required to report TAC emissions as part of certain permitting actions or as part of the triennial Air Toxics Emissions Inventory. The information below summarizes these reporting requirements and provides access to associated tools and forms. 

2026 Air Toxics Emissions Inventory Report

The Air Toxics Emissions Inventory is a mandatory reporting event conducted every three years. The 2026 operating year is underway, and emissions data for 2026 will be due in 2027. All facilities holding a Title V, ACDP Simple, or ACDP Standard permit are required to report. Additional background information is available on the Air Toxics Reporting Background page.

Reporting for the 2026 ATEI will occur through the Your DEQ Online platform. Updated instructions, tools, and guidance will be posted to this webpage as they become available.

Please note that this statewide, periodic emissions inventory is separate from permit annual reporting and separate from the emissions inventory submitted as part of the Cleaner Air Oregon risk assessment process.

Sources in Lane County

Facilities located in Lane County should communicate directly with Lane Regional Air Protection Agency staff with questions about emissions reporting and submitted data.  

Notice of Construction and Modification

Rule updates adopted in November 2021 expanded the definition of regulated pollutants in Oregon to include TACs under Division 210. As a result, facilities must provide information on TAC emissions listed in OAR 340-247-8010: Table 1 when proposing changes that may affect emissions.

Unpermitted and permitted facilities submitting a Notice of Construction and Modification application, an ACDP Amend application, or a Title V Amend application may be required to report anticipated toxic emissions if the proposed construction or modification will increase TAC emissions. Applications are submitted through Your DEQ Online. Required toxics reporting is completed using an Excel‑based attachment that must be prepared prior to application submission.

The information below is intended to clarify when to use the AQ104B Toxics reporting form and the tools are provided to facilitate common reporting scenarios.

• AQ104B Toxics Reporting Form
  
• AQ104B Toxics Quick Guide for Material Balance 
• Combustion Emission Factors 
• Welding Emission Factors

Exceptions

Certain construction projects or changes do not require an AQ104B Toxics reporting attachment if any of the following apply:

• This is a Notice of Construction Type 1 submittal for specifically listed equipment under OAR 340-210-0225(1)(b).
• There is no increase in emissions of any Toxic Air Contaminants associated with the application.
• The project proposes to only replace like-for-like equipment or processes without an increase in quantity and/ or a change in the composition of TAC emissions (e.g., the change does not emit more or new TACs than are currently emitted).
• The project proposes to only install equipment that solely combusts natural gas, propane, liquified petroleum gas, pretreated landfill gas and pretreated digester gas or biogas, and qualifies for the gas combustion exemption under OAR 340-245-0050(5).
• The project proposes to install pollution control device(s) that do not emit new TACs other than those covered by the gas combustion exemption under OAR 340-245-0050(5).
• The project proposes to install an emissions unit that satisfies the criteria for designation as an Exempt TEU under OAR 340-245-0060(3) and DEQ has approved this designation.
• The project is for an emergency generator less than 150 hp that operates for a maximum of 100 hours/year.

Contacts

For all other permitting questions, contact your regional DEQ permitting office.

For LRAPA facilities, please contact LRAPA directly at 541-736-1056.