In conjunction with heightened global environmental awareness, exhaust gas regulations will become increasingly strict in North America and Europe. Furthermore, emerging nations are also planning to strengthen exhaust gas regulations in conformance with European standards.

Furthermore, through the implementation of the Worldwide harmonized Light vehicles Test Procedure (WLTP), exhaust gas testing conditions will become increasingly strict. The implementation of particulate matter (PM) regulations for gasoline vehicles is also planned.

In response to global warming, it is necessary to reduce the amount of CO₂ emissions from automobiles. Improved fuel economy is becoming increasingly important as a measure for reducing emissions. Accordingly, strengthening of emissions regulations is planned.

In response to the strengthening of exhaust gas regulations and fuel economy regulations, automotive manufacturers are working to develop new types of engines. A variety of catalysts must be developed in order to support these new engines.