NSW Transport Minister Andrew Constance plans to move quickly to electrify Sydney's 8000-strong bus fleet to cut diesel emissions and reduce the adverse health impact of air pollution on residents.

After meeting officials in Europe who are moving to electrify their bus fleets, Mr Constance wants the state's transport agency to conduct an assessment so that the government can put targets on the plan to convert Sydney's fleet from diesel buses.

NSW Transport Minister Andrew Constance wants to electrify Sydney's bus fleet. Credit:AAP

"I will launch a full-scale assault on this with Transport for NSW," he said. "We are going to see organically more electric buses but I want to put rigour to this."

Mr Constance said his plan to convert Sydney's ageing diesel fleet to electric was inspired by a recent trip to Europe where he met officials at Transport for London who have conducted air quality testing showing about half of the city's air pollution was caused by road transport.