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Emissions Inventory Reporting Requirements

An emission inventory (EI) is a listing, by source, of the amounts of pollutants actually emitted to the atmosphere over a period of time.

The emission inventory is required by Code of Federal Regulations 40 CFR Part 51 Subpart A - (Air Emissions Reporting Requirements) and requires that emissions data be collected from certain facilities by all state agencies responsible for regulating air pollution and submitted to the EPA. The EPA uses these submittals to build the National Emissions Inventory (NEI). The National Emissions Inventory is a national database of comprehensive estimate of annual air emissions of criteria pollutants, criteria precursors, and hazardous air pollutants from point, nonpoint, and mobile air emissions sources. An updated version of the NEI is released every three years.

** On February 12, 2018, the State of Tennessee Rule for Emissions Inventory Requirements that applies to facilities meeting the criteria specified in 40 CFR Part 51 Subpart A was adopted. The detailed information for this rule is available on the Tennessee Secretary of State website at  **

Facilities whose potential emissions equal or exceed thresholds shown in the tables below for any of the indicated pollutants are required to submit actual emissions data to the Division of Air Pollution Control by June 1 following the year of inventory.

Any facility that fails to respond to an EI submittal request by June 1 of each year, may be subject to enforcement action for violation of the Tenn. Comp. R & Regs Rule 1200-03-10-.05

Calendar Year 2020 Thresholds​1

Pollutant Triennial Type B sources​
(1) SO2 ≥100
(2) VOC ≥100
(3) NOX ≥100
(4) CO ≥1000
(5) Lead ≥0.5 (actual)
(6) Primary PM10 ≥100
(7) Primary PM2.5 ≥100
(8) NH3 ≥100

1Thresholds for point source determination are shown in tons per year of potential to emit as defined in 40 CFR part 70, with the exception of lead.  Reported emissions must be in actual tons emitted for the required time period.


Calendar Year 2021 Thresholds1

Pollutant Every-year (Type A sources)2
(1) SO2 ≥2500
(2) VOC ≥250
(3) NOX ≥2500
(4) CO ≥2500
(5) Lead Not applicable
(6) Primary PM10 ≥250
(7) Primary PM2.5 ≥250
(8) NH3 ≥250

1Thresholds for point source determination are shown in tons per year of potential to emit as defined in 40 CFR part 70. Reported emissions must be in actual tons emitted for the required time period.

2Type A sources are a subset of the Type B sources and are the larger emitting sources by pollutant.


SLEIS Training Webinar


SLEIS Title V Fees & AEAR Training Webinar

Access to State & Local Emission Inventory System (SLEIS)

Navigate to SLEIS here:


Please notice that:

  • The Division of Air Pollution Control (APC) Emissions Inventory Team is announcing  a change to the Emissions Inventory process in Tennessee. Beginning with the 2019 Emissions Inventory report to be submitted by June 1, 2020, the process for completing and submitting a facility emissions inventory report is moving to an online internet based system. This online internet based system, known as the State/Local Emissions Inventory System (SLEIS), has been in development for some time.  A pilot project was initiated in the Fall of 2018 and continued in 2019 for those participant facilities we selected for the pilot project. The pilot project has been completed.  As such, the emissions inventory reporting process has officially transitioning to SLEIS.  Each year's emissions inventory report is required to be prepared and submitted through SLEIS by the due date of June 1.  The Excel spreadsheets known as the EDL and emailed to APC will no longer be accepted as a valid emissions inventory report submission.
  • 2020 Emission inventory data must be submitted in the SLEIS online application.
  • Download the SLEIS Registration Form and Instructions
  • SLEIS will contain Total Emissions (total allowable and total actual emissions). The Division requires facilities to report their permitted allowable emissions limits and total actual calendar emissions.
  • Emission inventory submittals must be complete and accurate.
  • CSV tool for your aid:  **UPDATED_09/25/20** CSV File Editor_v20.06.12 and Instruction_v20.06.12
  • PM10-FIL, PM10-PRI, PM-25-FIL, PM25-PRI and PM-CON are the only acceptable pollutant codes for submittal of particulate matter. APC suggests that the PM specified in the Title V permit most closely correlates to PM10-FIL
  • Although reporting of hazardous air pollutants (HAPs) is voluntary, we strongly encourage you to report individual HAP emissions. The individual HAP-VOC emissions for each process must be reported in total VOC emissions for each process. The total VOC emissions must be greater than or equal to the HAP-VOC emissions.
  • All pollutants specified in the tables above must be reported, not just the pollutants that qualify the source as a point source.
  • Minor sources, conditional major sources with federally enforceable permit limits, and sources that are major for HAP only are not required to report emissions. Any sources with actual lead emissions of 0.5 tons per year or more must submit their emissions on a triennial basis.

Emission inventory data are used for:

  • Attainment/nonattainment designations for criteria air pollutants
  • State Implementation Plans (SIPs) for attainment and maintenance of the NAAQS
  • Rule development
  • PSD permit reviews
  • Air Quality & Human Health Effects Research

Related Links

Contact Information

Emission Inventory Group