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to see if your business is eligible for confidential, non-regulatory assistance.
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all DNR permits to see which may be required.
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Contact information
For information about the Small Business Environmental Assistance Program, contact:
Small Business Hotline
Toll free: 855-889-3021
DNRSmallBusiness@wisconsin.gov

Air regulations

Air quality regulations are enacted to minimize the amount of pollution present in the air we breathe. For Wisconsin, both the U.S. Environmental Protection Agency (EPA) and Department of Natural Resources (DNR) implement and enforce a range of air pollution regulations. This page will guide you through the different types of air pollution regulations that may affect your business and provide links to specific regulations.

State regulations

State regulations

All state regulations are contained in the Wisconsin administrative code. Each chapter is available in PDF format, and the best place to start is the Wisconsin Administrative Code table of contents for Natural Resources (NR) codes [exit DNR]. Air regulations are contained in chapters NR 400-499.

Some air regulations that affect many small businesses include:

  • NR 400: Definitions
  • NR 405, 406, 408: New Source Permits
  • NR 407: Operation Permits
  • NR 410: Air Fees
  • NR 415: PM Limits
  • NR 419-425: VOC Rules – RACT & LACT
  • NR 431: Visible Emissions
  • NR 438: Emissions Inventory

It is important to review all requirements in case there is a unique situation that affects your business.

Chapter NR 445, the state hazardous air pollutant rule:

Both the EPA and DNR have regulations affecting emissions of air toxics, which are also called hazardous air pollutants (HAPs). The regulations created by each agency are very different in the way they apply to businesses. The DNR's regulations contain a provision in which, if a business has to reduce emissions of certain HAPs under EPA's rules, that business does not have to apply DNR's regulations to those same HAPs. Because DNR and EPA do not regulate the exact same HAPs, you should review both sets of rules to see whether they affect your business. Select the Federal regulations tab above for information on EPA's HAP rules.

Chapter NR 445, Wis. Adm. Code, (State Hazardous Air Pollutant Rule) was last revised 2004. All facilities affected by the rule should be in compliance. The rule changes allowed for options in how a facility demonstrates compliance with the rule.

Information on the rule and how it might apply to a company can be found on DNR's air toxics and mercury page. The "Chemical spreadsheet tool" tab has an Excel spreadsheet which allows you to filter the list based on the chemical name or CAS# of a HAP and quickly find the NR 445 threshold(s) used to evaluate if your operation complies.

For more information about this requirement, contact:
Jeff Myers
Environmental toxicologist
608-266-2879
or find a specific contact at:
Air Management Program contacts
Ozone depleting compounds

Refer to the DNR's Refrigerant recovery program web page for more information.

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Federal regulations

U.S. EPA's regulations, including the Clean Air Act, are spelled out in the Code of Federal Regulations. To find a particular rule, you can go to EPA's Laws & Regulations [exit DNR] page or the Electronic Code of Federal Regulations [exit DNR] site. To comment on any proposed federal regulations, go to Regulations.gov [exit DNR].

Accidental release or RMP rule

EPA's RMP Rule is aimed at preventing and minimizing the consequences of accidental releases of hazardous chemicals. This rule requires companies with listed chemicals in sufficient quantities to submit a risk management plan to EPA. To learn more about EPA's RMP Rule [exit DNR] page. DNR's SBEAP has a brief fact sheet that describes U.S. EPA's Accidental Release Prevention Rule (112r RMPs) (SB-102) [PDF].

National EMissions Standards for Hazardous Air Pollutants (NESHAP)

The EPA is required under s. 112, Clean Air Act, to write rules called MACT (maximum achievable control technology) standards as part of their national emissions standards for hazardous air pollutants (NESHAP) program. The MACT standards are generally applied to major sources.

The EPA has also been developing area source rules under the NESHAPs. These rules may use MACT or GACT (generally achievable control technology) standards, depending on factors related to the ability of the smaller sources to install controls or use best management practices.

All of EPA's NESHAP rules are final. Check EPA's National Emission Standards for Hazardous Air Pollutants [exit DNR] page for links to detailed information about each of the rules issued by EPA. They are listed by Source Category.

For information on reporting and notification requirements for NESHAP rules, refer to DNR's Frequently asked questions NESHAP page. The table below provides some information from EPA and/or DNR on rules likely to affect many Wisconsin businesses.

Rule effective date Additional information

12/20/2012

Combustion related rules

3/3/2010

Reciprocating Internal Combustion Engine or RICE Rule

7/23/2008

Nine metal fabrication and finishing source categories

7/1/2008

Plating and polishing operations

NOTE: EPA clarified due dates for compliance reporting in their brochure. The annual reporting required by January 31 does NOT start until AFTER the compliance deadline of July 1, 2010, or January 31, 2011. You prepare the report each year after that but do not submit anything unless you have deviated from the rule requirements.

1/10/2008

Gasoline distribution and dispensing
  • Refer to DNR SBEAP's Gas Stations page for information on these regulations.

1/9/2008

Paint stripping and miscellaneous surface coating operations, including auto body repair and refinishing shops

Regulatory resources

If you have an issue regarding regulatory enforcement and compliance activities by a federal agency, you can provide comments to the Small Business Administration's (SBA) National Ombudsman [exit DNR]. Comments are included in the SBA's national ombudsman's annual report to Congress.

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Last revised: Thursday June 29 2017