Samenvatting
Buses should have an important role in improving urban air quality by providing an alternative to passenger cars for many journeys. However buses have their own environmental problems, namely the emission of particulates and nitrogen oxides. These must be solved if buses are to be part of the solution to urban air pollution. The introduction of low polluting buses is only likely to happen if there is some form of government intervention. Likewise government action is required to persuade people to get out of their cars onto buses. (A)