Environmental aims form strong drivers for the automotive industry. This manifests in pressure to reduce NOx, SOx, and CO2 emissions while continuing to give consumers the vehicle performance they have grown to expect. The trend to smaller and more fuel efficient cars creates a challenge to an industry which has traditionally made more profit on larger vehicles. Customers expect an increasing level of computerised features which involve complex real-time data generation and engine adjustments. The long term viability of diesel-powered vehicles is a matter of public debate.