Environmental Considerations (Engine Exhaust Emissions Regulations)

Generator sets, regardless of application, may be subject to engine exhaust emissions regulations on a local or national level or both. Compliance with emissions regulations usually requires special permits. Certain localities may have specific designations requiring gaseous–fueled engines and/or exhaust after–treatment strategies for diesels. Check with the local air quality agency early in the design phase of any project for permitting requirements.

From - Application Manual – Liquid Cooled Generator Sets (Cummins Power Generation)