Restrictions on emissions from construction machinery being used on projects on London are to introduced to cut air pollution in the capital.
Under plans announced by the London Mayor, Boris Johnson, emissions from bulldozers, dump trucks and excavators will be 40% lower by 2020 than in 2010.
The new rules will require construction equipment to meet standards for particulates (PM10) and nitrogen oxide.
Equipment over 10 years old will need to be either replaced or retrofitted to work on all developments in central London and major projects in outer London.
the environmentalist reported in June that the Crossrail project, which is linking Heathrow and Reading to the west of London with Abbey Wood and Shenfield to the east, had introduced standards for contractors to limit emissions from construction equipment.
They require contractors to use diesel-powered plant machinery with newer, cleaner engines (Euro IIIB standard) or retrofit diesel particulate filters on to existing engines.