The air permitting program requires industry to ensure new or air emission sources meet the regulations when they are built or when certain changes are requested. An air permit is required before the installation, or the changes can be made. These preconstruction air permits are commonly referred to as a "Permit to Install" (PTI). 

PTI applications may be put out for public comment for a variety of reasons, such as the level of pollutants being requested or because the application is of public interest.

Larger sources of air pollution are also required to have a major source permit, commonly known as a "Title V permit" or "Renewable Operating Permit" (ROP). This type of air permitting must be opened for public input. This section contains information about permits open for 30-day public comment, in 45-day comment for USEPA, and those that have had a final decision.

The Acid Rain Program and the Cross-State Air Pollution Rule (CSAPR) can be important parts of air permitting. Draft applications are included in chronological order, with those comment periods ending sooner at the end of the list, and those most recently listed at the top.

The AQD operates an Air Toxics Program where toxicologists develop health-based screening levels using in the air permitting process. A 30-day formal public comment period is held on all health-based screening levels and their justifications.

As a part of AQD's Enforcement Program, written comments are accepted on proposed consent orders to administratively resolve alleged air pollution violations for the following sources.

Michigan's Air Pollution Control Rules are made up of multiple "parts" each covering its own subject matter and/or pollutants, which often need updating. It is also possible the AQD needs to create new rules to address air quality issues in the state. These are included in Michigan's State Implementation Plan (SIP). Some portions of the SIP are occasionally open to public input.