Construction permits, also called New Source Review permits, are required for constructing a new air pollution source, or modifying an existing source. Construction and modifications refer to activities that will increase air emissions, including changes in operation, adding equipment, changes in fuel or raw materials and relocating previously permitted sources. Certain activities have been determined by the state to be an insignificant source of emissions and are exempt from permitting requirements, according to 10 CSR 10-6.061. For information about operating installations, please visit Air Operating Permits.
**Important Update**
The U.S. Environmental Protection Agency 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. On June 6, 2025, the U.S. Court of Appeals for the Eighth Circuit issued an order granting Missouri’s motion to stay the effectiveness of EPA’s final rule, which changed and added new permitting requirements. While the stay is in effect, the moderate nonattainment area permitting requirements will remain in place. For more information, please review the document below.
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.