or machine characteristics, and the ability of firms to innovate in the face of regulation. The committee has been unable to obtain detailed quantitative information on the pricing of vehicles and other mobile sources, and the production and employment effects of different standards in the past.
Recognizing the needs of some states to adopt more stringent mobile-source emissions standards to help improve air quality, a desirable objective is to harmonize CARB’s and EPA’s certification procedures. Although meaningful differences in standards can be important in achieving clean air, superficial differences, in such areas as certification procedures, can be wasteful. Harmonization of standards and testing procedures also has the global context of foreign manufacturers producing and selling their products within the United States and domestic manufacturers producing and selling their products globally.