Air injection: A system of emission control in which fresh air is supplied to the engine exhaust which facilitates the conversion of CO to CO2 and partially burnt hydrocarbons to burn completely. Related posts: Personnel Management Operative Functions Administrative Role of PM Competency HR Management Role Change Personnel Policies Personnel Procedures Appealed Policies Implied Policies Specific Policies Personnel records Research Pure research Personnel research Attitude or Opinion Survey Turnover Secondary research Applied research Personnel audit Read more articles Previous PostAir cleaner Next PostAlternator