Clean Air Act: A law that limits the amount of pollutants are produced by factories, cars, etc...
NOx Gas: Nitrogen Oxide gas that affects both the environment and human health
Defeat Device: Software added into cars that would recognize that it was being tested and would then limit the car's performance to reduce the NOx gasses emitted.
EPA: United States Environmental Protection Agency
VW: Shorthand term for Volkswagen
Settlement: an official agreement intended to resolve a dispute or conflict
Emission Standards: Laws set to restrict the amount of emissions emitted
Diesel engine: an engine that uses a slightly different
Emissions tests: Tests directed by the EPA to make sure the cars meet the emissions standards
Software: A program installed into the computer of the car