- Achieving Ultra-Low NOx Emissions from Heavy-Duty Trucks (April 2019) (PDF 1.2 MB)
- Aftermarket Converter Regulations - Recommendations for Successful Implementation (July 2013) (PDF 26 KB)
- Motor Vehicle Emissions and Air Quality in the U.S. (PDF 41 KB)
- The Catalytic Converter: Technology for Clean Air (August 2011) (PDF 77 KB)
- Cleaner Fuels for Cleaner Motor Vehicles (August 2011) (PDF 42 KB)
- Emission Controls for Diesel Engines (PDF 98 KB)
- Diesel Retrofit Technology FAQ (October 2010) (PDF 94 KB)
- The Motor Vehicle Emission Control Industry (PDF 33 KB)
