This is a quick guide put together by the NGA Center for Best Practices. It explores what clean air programs currently exist and how they are being financed. Rather than stating one best practice to tackling clean air, this report creates a table of the different programs, how they are being financed, and in what state. Governors and their staffs can then look for characteristics and solutions that are most realistic and applicable to their situation. The key is to tailor current practices that are in the world to the specific situation you are looking to solve. Best practices are meant to give insight into existing strategies.