This document is intended to provide a guide or roadmap to assist you in determining whether your business requires an air pollution control permit or registration from the Bureau of Air. Figuring out whether or not a permit or registration is needed has been confusing and frustrating to many small businesses. While this document is intended to help explain how to make this determination, it does not provide a definitive answer for every person or facility. Permit decisions can be complex matters and situations requiring interpretation and assistance can arise. You are encouraged to call the Agency's Bureau of Air Permit Section at 217-785-1705 if you have additional questions or concerns. Someone will be ready to assist you. If you have questions on the requirements for registration under the Registration of Smaller Sources, also known as the ROSS program, you should call the Small Business Environmental Assistance Program (SBEAP) at 800-252-3998. You may also wish to obtain assistance from an independent environmental professional of your choice.