This curriculum is intended to serve as a guide for high school instructors teaching a basic course on emission control systems on General Motors, Ford, and Chrysler products. The material may also be incorporated on an engine system basis and inserted into an overall tune-up curriculum. Other uses of the curriculum include specialized training for out-of-school youth and adults who wish to upgrade their skills or to enter this field. Curriculum content is divided into eight areas: air pollution, positive crankcase ventilation system, thermostatic air cleaners, air injection reaction (air system), exhaust gas recirculation system, spark control system, catalytic converter systems, and carburetor adjusting procedures. Informative material and some visual aids/diagrams are provided for topics covered in each of the eight areas. Appendixes include definitions of terms, a list of motor vehicle emissions control manufacturers' abbreviations, sources for manufacturer's emissions control manuals, and a list of public information materials. (YLB)