The National Center for Vehicle Emissions Control and Safety (NCVECS)
Automobile Emissions: An Overview by the EPA
Guidance for the Implementation of Accelerated Retirement of Vehicles Programs (DOT)
The following is a list of states that have Emission Inspection Programs:
Arizona, California, Colorado, Connecticut, Deleware, District of Columbia, Florida, Georgia, Illinois, Indiana, Kentucky, Louisiana, Maryland, Massachusetts, Michigan, Missouri, Nevada, New Jersey New Mexico, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, Tennessee, Texas, Utah, Washington, Wisconsin
Arizona vehicle emissions inspection
Colorado Department of Public Health and Environment (CDPHE)
Connecticut Enhanced Emissions Technician Training and Certification Program
Florida Emissions Requirements
Illinois Vehicle Emissions Testing
Indiana Department of Environmental Management
Maryland Vehicle Emissions Inspection Program
Massachusetts Emissions Checkup
Missouri Air Pollution Control Program
New Jersey Enhanced Motor Vehicle Inspection and Maintenance Program
New York State Enhanced Emissions Inspection Program
Pennsylvania Auto Emission Inspection Program
Texas Vehicle Emission Inspection Program Senate bill 178
Wisconsin Vehicle Inspection Program (VIP)