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Passenger Car and SUV Selective Catalytic Reduction (SCR) systems were first introduced to the market in 2008. These systems were developed to meet the stringent LEV-II Tier 2 Bin 5 exhaust emissions regulation in US and EURO 6-1 regulation in Europe. New emission regulations are being proposed. For Europe EURO 6-2 is about to be defined and will start to apply in 2017. In US, LEV-III SULEV requirements phase in from 2015 to 2025 and are mandatory for all vehicles starting in 2020. These amendments generate a new evolution of requirements for automotive SCR systems: A first effect of this evolution is that the most efficient NOx reduction technology, combined with more efficient combustion in the engine for CO₂ reduction, needs to be adopted on a wider range of cars. As a result, compact diesel vehicles will need to apply SCR technology. Also, the increased need for NOx reduction leads to an increase in AdBlue®/DEF consumption on each vehicle.