Existing Business
Exemptions

Even if you were not exempt in some of the specific categories, you may be exempt based on your total emissions (emission levels below). You may wish to attempt the calculations on your own (see below) or you may prefer to contact DNR air staff or Department of Commerce air staff (scroll to bottom of either page) to help you determine if you are exempt.

General Exemptions
To qualify for a general exemption you must meet ALL of these levels.

• Volatile Organic Compounds (VOCs), Particulate Matter (PM) or Nitogen Oxides (NOx) — do not exceed 5.7 lbs/hour for each air contaminant
• Sulfur Dioxide (SO2) or Carbon Monoxide (CO) — do not exceed 9.0 lbs/hour
• Lead — do not exceed 0.13 lbs/hour
• Single Federal Hazardous Air Pollutant — 10 tons/year
• Combination of Federal Hazardous Air Pollutants — 25 tons/year (Federal HAPs list in s. 112(b), Clean Air Act, includes 188 compounds
• State Hazardous Air Pollutants — MTE < Thresholds in ch. NR 445 (State HAPs list in ch. NR 445, Wis. Admin. Code, includes 550 compounds, with some overlap with the federal HAPs)
• New Source Performance Standards and National Emissions Standards for Hazardous Pollutants

Whether you attempt the calculations yourself or you would rather contact DNR air staff or Department of Commerce air staff (staff links at bottom), please have the following information ready:

1. Material Safety Data Sheets (MSDS) (associated with coatings, solvents, cleaners, raw materials, etc.)
2. Heat Input Rating (in BTUs) (e.g. boilers, furnaces, heating units. The rating is usually found on furnace specification sheet or on furnace itself)
3. Maximum raw material usage (all processes) (e.g. paint guns, woodworking equipment, printing presses, etc.)

Click on each of the categories that fits emissions sources at your facility to help you perform the calculations to determine if you are exempt under the general exemptions.

Which process(es) do you have at your facility? (Select the appropriate category below.)

• Combustion
• Volatile Organic Compounds (VOCs)
• Material Handling
• Miscellaneous Processes

Now that you have determined your status, please choose the "Exempt" or "Not Exempt" button below to continue.