**Important Update**
The U.S. Environmental Protection Agency recently published a final rule reclassifying the Missouri portion of the St. Louis ozone nonattainment area from Moderate to Serious nonattainment for the 2015 ozone standard. This action changed and added new permitting requirements that became effecting in the nonattainment area on Dec. 31, 2024
Construction permits, also called New Source Review permits, are required for the construction of a new air pollution source, or modification of an existing source. Construction and modifications refer to activities that will increase air emissions and include changes in operation, addition of equipment, changes in fuel or raw materials and the relocation of previously permitted sources. Certain activities have been determined by the state to be a source of insignificant emissions and are exempt from permitting requirements per 10 CSR 10-6.061.
Note: The following information is not meant to be a tool to determine applicable federal and state regulations for a specific situation. The method of choice should always be a thorough review of the state and federal rules and regulations.