1. Retrofit Emission Controls for On-Road Diesel Engines OCA Air Quality Summit Fresno, CA October 27, 2005 Manufacturers of Emission Controls Association www.meca.org

2. Retrofit Emission Control Technologies: Building an Impressive Experience Base Diesel Particulate Filters Diesel Oxidation Catalysts Flow through monolith with catalytic coating CO Aldehydes HC PAH SO 2 NOx CO 2 H 2 O SO 2 /SO 3 NOx  Level 1 PM Reduction  Large Reduction in Toxics  Nearly Universal Application with > 1 Million Retrofits Worldwide  Tens of Millions of OE Applications  Level 3 PM Reduction  Large Reduction in Toxics  > 200,000 Retrofits Worldwide  > 1 Million OE Applications

3. Experience with Diesel Particulate Filter Retrofits Spans a Variety of On-Road Vehicle Applications

4. Retrofit Options for PM Control Expanding DPF Exhaust gas Diesel vapor DOC Fuel Injection Unit Filter systems with active regeneration for cool exhaust applications –Diesel fuel provides regeneration heat source –Other “active” options can include electric heaters, fuel burners Open or “partial” filters using wire mesh or sintered metal sheets –Level 2 PM reduction potential Closed crankcase filters for additional PM control Heat

5. Integrated Solutions for Combined PM/NOx Reductions Available for Retrofit Emulsified Diesel Fuel + DOC or DPF – 15-40% NOx reduction Low Pressure EGR + DPF – 40-60% NOx reduction Lean NOx Cat. + DPF or DOC – 25-35% NOx reduction SCR catalyst Pre- catalyst Slip catalyst NH3 injection Exhaust gases DOC + SCR – 70-80% NOx reduction

6. Key Considerations for Successful Retrofit Programs Application engineering Installation On-vehicle monitors Maintenance  Successful Retrofits Require a Team Effort Between Fleet Owners, Operators, and Technology Providers

7. Emission Control Industry’s Perspective on Retrofits Proven Technology Available Technology Options Expanding Application Range Expanding Retrofit “Success” Builds on Experience Checklist Incentive Funds Needed to Make Large Impact on Air Quality Technology Verification Important but Must Be Resourced and Streamlined to Deliver Product to the Market at a Faster Pace

8. www.dieselretrofit.org