There has been a lot of talk in the press about the fact that diesel cars are going to be penalised for producing higher amounts of dangerous chemicals than previously thought. Back in the 1990s, drivers were positively pushed towards driving diesel cars, under the premise that they produced lower amounts of carbon dioxide than petrol cars. In the years since, scientists have discovered that diesel cars actually emit much higher levels of nitrogen monoxide which is far more dangerous than previously believed.
As a result, the government now is acting to reduce the levels of dangerous chemicals being emitted, by taxing diesel cars much higher than previously. There are also plans to increase the London congestion charge zone to charge extra fees for diesel drivers in order to create lower emission zones. It is thought that other cities and towns will introduce similar zones which effectively ban diesel vehicles from their streets.