Notice of Intent to Revise the State Implementation Plan - Periodic Emissions Inventory 2020
Notice of Intent of a Revision to the State Implementation Plan (SIP):
Periodic Emissions Inventory for Inventory Year 2020
The Commissioner of the Department of Energy and Environmental Protection (DEEP) hereby gives notice of intent of a revision to the SIP to satisfy the requirements of sections 172(c)(3) and 182(a)(3)(A) of the federal Clean Air Act (CAA). This revision to the SIP is a Periodic Emissions Inventory (PEI) for the year 2020 to satisfy inventory requirements for the 2008 and 2015 National Ambient Air Quality Standards (NAAQS) for ozone. The State of Connecticut is classified as nonattainment for the 2008 and 2015 ozone NAAQS and must therefore submit a periodic inventory of ozone precursors every three years. This Periodic Emissions Inventory will be submitted to the U.S. Environmental Protection Agency (EPA) for review and approval as a revision to the SIP.
EPA requires each State to inventory point, nonpoint, mobile and biogenic emissions sources and report this information to EPA for the pollutants set out in the Air Emissions Reporting Rule (40 Code of Federal Regulations (CFR) 51, Subpart A) including sulfur dioxide (SO2), volatile organic compounds (VOCs), nitrogen oxides (NOx), lead and lead compounds, primary particulate matter (PM2.5, PM10), and ammonia (NH4). Various data sources were used to develop these inventories including point source emissions data reported by the owners and operators of emitting facilities within Connecticut through their annual emissions statements, EPA inventory estimates, and modeled mobile source emissions.
The underlying datasets used by the State to produce the 2020 Periodic Emissions Inventory are provided by federal and external partners. The timing of the initial data releases is often well after the reporting period closes and is not within the State’s control. Once the data became available, the State completed the required quality assurance, processing, and evaluation steps to prepare the inventory.
This multi-year lag is typical for periodic emissions inventories and ensures that the information submitted as a SIP revision is complete and accurate.
The authority to adopt this SIP revision is granted by sections 22a-6 and 22a-174 of the Connecticut General Statutes (CGS). This notice is required pursuant to CAA section 110(a)(2) and 40 CFR 51.102.
Written comments. Interested persons are invited to comment on the 2020 Periodic Emissions Inventory. Comments should be submitted no later than 4 pm on Friday, November 20, 2026 via electronic mail to Rebecca McLean Stanford at Rebecca.McLean@ct.gov.
Public hearing. In addition to accepting written comments, DEEP will also hold a public virtual hearing, only upon request, at 2 pm on Wednesday, November 18, 2026. A request to hold the hearing may be made by any person by electronic mail to Rebecca.McLean@ct.gov. Such a request must be made by 4 pm on Wednesday, October 28, 2026. If no request for a hearing is received on or before Wednesday, October 28, 2026, the hearing will be cancelled. Information on the status of the hearing, and details concerning the hearing formatting and timing, if it is not cancelled, will be posted on DEEP’s website at Public Notices: 2020 Periodic Emissions Inventory, as of Friday, November 6, 2026. Questions concerning the status of the public hearing may be directed to Rebecca.McLean@ct.gov or (860) 424-3511.
Additional information. The inventories described above are posted on the DEEP website at Public Notices: 2020 Periodic Emissions Inventory. For further information, contact Rebecca McLean Stanford of the Bureau of Air Management by electronic mail to Rebecca.McLean@ct.gov.
ADA PUBLICATION STATEMENT
The Connecticut Department of Energy and Environmental Protection is an Affirmative Action/Equal Opportunity Employer that is committed to complying with the requirements of the Americans with Disabilities Act. If you are seeking a communication aid or service, have limited proficiency in English, wish to file an ADA or Title VI discrimination complaint, or require some other accommodation, including equipment to facilitate virtual participation, please contact the DEEP Office of Diversity and Equity at 860-418-5910 or by email at deep.accommodations@ct.gov. Any person needing an accommodation for hearing impairment may call the State of Connecticut relay number - 711. In order to facilitate efforts to provide an accommodation, please request all accommodations as soon as possible following notice of any agency hearing, meeting, program or event.
/s/Tracy Babbidge
Tracy Babbidge
Acting Deputy Commissioner