However, there are various steps that governments could take to tackle these problems. Firstly, they could invest money in the building of affordable or social housing to reduce the cost of living. Secondly, politicians have the power to ban vehicles from city centres and promote the use of cleaner public transport, which would help to reduce both air pollution and traffic congestion. In London, for example, the introduction of a congestion charge for drivers has helped to curb the traffic problem. A third option would be to develop provincial towns and rural areas, by moving industry and jobs to those regions, in order to reduce the pressure on major cities.