Annual emission estimates are one important component of tracking progress on air pollution and tracking performance and relative contributions of pollution sources. These emission estimates are made possible through emissions reporting from permitted and non-permitted facilities across Minnesota. The Minnesota Pollution Control Agency (MPCA) collects emission estimates from major air pollutants including criteria air pollutants, air toxics, and greenhouse gases.
If you are an owner or operator of a permitted air quality facility, you are required to submit an annual air emission inventory. The submittal of an annual inventory is a requirement of your air quality permit and must be completed by April 1 of each year.
Large inventory type permit holders and facilities with registration Option C or Option D permits must submit an air emission inventory using the MPCA’s e-Services electronic reporting website. Instructions and additional information on electronic reporting are available on the Air emissions inventory – Electronic reporting webpage.
For specific reporting requirements, review the reporting categories by pollutant group below.
The emission inventory rule requires all air permitted facilities to submit an annual emission inventory report of criteria pollutants to the MPCA. This is used to track the actual pollutant emissions of each facility and then used to calculate an annual emission fee for each facility. Please visit the Criteria pollutant emission inventory fees page for more information about emission inventory fees.
If your facility holds a registration Option C, Option D, or a large inventory type permit, you will submit your criteria air pollutants emission inventory electronically using the MPCA’s e-Services electronic reporting website. Please visit the Air emissions inventory – Electronic reporting webpage for help getting started.
Facilities holding a registration Option B or a nonmetallic general permit must complete the appropriate form below and return the inventory report by April 1:
Minnesota Pollution Control Agency
Environmental Analysis and Outcomes Division
520 Lafayette Road
St. Paul, MN 55155
Forms and instructions
Option B Registration Permittees
- Quick guide - Option B Air Emission Inventory Report (aq-ei3-01)
- Air Emission Inventory: Inventory form (aq-ei3-02b)
Option C and Option D Registration Permittees
- Air Emission Inventory: Quick Guide - Account Creation and Registration
- Air Emission Inventory: Quick Guide to Electronic Reporting
Nonmetallic Mineral Processing General Permittees
- Cover letter - Nonmetallic Mineral Processing Air Emission Inventory Report (aq-ei3-07)
- Quick guide - Nonmetallic Mineral Processing air emission inventory report (aq-ei3-08)
- Air Emission Inventory Nonmetallic Mineral Mining: Inventory form (aq-ei3-09)
Large Inventory Type Permit Holders
- Air Emission Inventory: Quick Guide - Account Creation and Registration
- Air Emission Inventory: Quick Guide to Electronic Reporting - Large EI Type
For commonly asked questions about the criteria pollutant emission inventory, please see Criteria pollutant emission inventory FAQs.
Air toxics include the 187 Hazardous Air Pollutants (HAPs) listed in Section 112(b) of the Clean Air Act, plus additional pollutants that have been identified as significant contributors to the contamination of the Great Lakes, and pollutants monitored in the Minnesota environment.
If a facility is required to keep records of air toxics emissions as a condition of its permit, then it must submit air toxics emissions data. If it is not required to keep air toxics emissions records, then the MPCA strongly encourages the facility to join in the majority of individual air permit holders and submit air toxics emissions data voluntarily.
The MPCA will estimate air toxics emissions for facilities with Large Inventory Type and registration Option D permits that do not submit site specific data. Directly reported emissions data from facilities is preferred over MPCA staff estimates. Using data submitted by facilities results in a more reliable emission inventory.
Data is collected on air toxics emissions every three years. The MPCA does not charge fees for air toxics. The next collection of air toxics emissions data will take place in 2021, when facilities submit their emission inventory for calendar year 2020. At that time, Large Inventory Type Permit holders and facilities with registration Option D permits must submit air toxics emissions using the MPCA’s e-Services electronic reporting website.
For a complete air toxics list and recommendations on how to report data for specific groups of compounds, please visit the Pollutant categories for air toxics webpage.
Facilities holding a capped permit are required to report greenhouse gas (GHG) emissions in order to comply with capped permit requirements. Similarly, Option D compliance requirements mandate facilities holding an Option D registration permit to report GHG emissions. Title V permit holders are required to report GHG emissions to the MPCA under Minn. Statute 216H.021 Subd. 2. (b) (1).
The MPCA’s electronic reporting system will automatically calculate GHG emissions from combustion sources. The MPCA will calculate emissions for carbon dioxide (CO2), nitrous oxide (N2O), and methane (CH4) using emission factors from title 40, part 98, EPA Mandatory Reporting Rule. Facilities will have the ability to review and edit the combustion emissions data with site specific information if available. Additionally, facilities will also be able to report non-combustion GHG emissions (if applicable) through the MPCA’s e-Services electronic reporting website.
Please visit the Air emissions inventory – Electronic reporting webpage for help getting started with electronic reporting.
In December of 2014, the U.S. Environmental Protection Agency (EPA) amended 40 CFR part 98 general provisions to include about one hundred additional fluorinated greenhouse gases (F-GHGs) and fluorinated heat transfer fluids (F-HTFs). The MPCA strives to be consistent with the EPA. The MPCA has also added the additional chemicals to the list of available GHGs for emission inventory reporting. Please see the list of New greenhouse gas pollutants. The list includes pollutant names, their CAS numbers and Global Warming Potentials (GWPs).
New emission inventory reporting requirements for mercury
In 2014, the emissions inventory rule was amended to adopt new rules relating to mercury air emissions reporting; Minn. R. 7019.3000 subp.3. The rule requires facilities with actual mercury emissions of three pounds per year or more to submit an annual mercury emissions inventory to the MPCA.
When will my facility need to report mercury emissions in the future?
You must report mercury emissions annually if your facility exceeds three pounds of mercury emissions or more per year after controls.
Minnesota statute 116.925 requires electric utilities to report mercury emissions annually. Facilities that produce electricity in Minnesota must report mercury emissions through the MPCA’s e-Services electronic reporting website for any mercury emitted in Minnesota.
Facilities that provide electric energy at retail in Minnesota from electricity generated outside of Minnesota may report their mercury emissions using the Mercury Emissions Report Form. Please email this template to Chun Yi Wu at firstname.lastname@example.org. Only electronic submissions by e-mail will be accepted.
High global warming potential (GWP) gases
Minnesota statute 216H.11 requires manufacturers of high-GWP chemicals to report to the MPCA the amount of high-GWP gases they sell annually in Minnesota. The statue also requires purchasers who buy more than 10,000 metric tons of (CO2-equivalent) of any one high-GWP gas annually to report purchases of all high-GWP chemicals. For more information, please visit the high-GWP website.
Mobile air conditioners
Minnesota statute 216H.12 requires manufacturers selling or offering for sale motor vehicles that contain a mobile air conditioner HFC-134a report the leakage rate to the MPCA at least 90 days prior to the first date the new model will be offered for sale in Minnesota. For more information visit the MAC website.