Clean Cities
The Department of Energy (DOE) Clean Cities web site has a wealth of information and a resource for MWES.
You should look to see who your local Clean Cities Coalition is and get connected.
https://cleancities.energy.gov/coalitions
CNG Filters
We at Midwest Energy Solutions Inc. can help you service your system to give better performance for you and the end user. With products designed for CNG, (not compressed air) we give you a full range of products to filter natural gas as well as Compressed Natural Gas.