• STATES UNITEDSTATESENVIRONMENTALPROTECTIONAGENCY WASHINGTON, D.C.20460 AGENCY ENVIRONMENTALPROTECTION OFFICEOF ENFORCEMENTAND COMPLIANCEASSURANCE November20, 2020 Jason E. Sloan Paul Miller Executive Director Executive Director Association ofAir PollutionControl Agencies Northeast States for Coordinated Air Use 1776 Avenue of the States Management Lexington, KY 40511 89 South Street, Suite 602
[email protected] Boston, MA 02111
[email protected] Miles Keogh Executive Director National Association for Clean Air Agencies 1530 Wilson Boulevard - Suite 320 Arlington, VA 22209
[email protected] Re: Tampered Diesel Pickup Trucks: A Review of Aggregated Evidence from EPA Civil Enforcement Investigations Messrs. Sloan, Keogh, and Miller, I hope this letter finds you well. First, I want to thank you for your continued partnership in our work for cleaner air, which concerns a wide range of sources of air pollution . I am writing on the specific issue of tampering and aftermarket defeat devices. I have discussed this subject with your organizations and members many times over recent years , and I know you share the agency’s concern with this illegal activity . In those discussions, people often asked about how prevalent tampering is, and how much excess air pollution comes from tampered vehicles and engines . While we acknowledge that it remains difficult to provide comprehensive answers to these questions, EPA has been able to gain some insights on them through our enforcement work concerning tampering and aftermarket defeat devices for diesel pickup trucks. We drafted the enclosed Report to help states better understand inquantitative terms the extent of tampering and aftermarket defeat devices that the enforcement personnel are seeing in the course of our work .