China's northern city of Tianjin took delivery of 500 electric buses last week for use as public service vehicles, according to local reports.

The buses were developed by Shenzen-based BYD with the collaboration of bus operator Tianjin Bus Group. They have a range of 200km (120 miles) on a single charge, enough for their daily operations, according to the bus operator.

A new charging station has also been completed in the city with the capacity to charge 80 buses at a time, or 448 buses daily.

The reports claim Tianjin now operates 3,220 new energy buses, of which almost 1,350 units are electric-powered.

China has been in the news in recent weeks for the choking smog that has enveloped its main cities, mostly in the north of the country. The smog is typically made up of fine dust caused by coal power stations, vehicle exhaust and naturally occurring dust. Tianjin is one of the country's worst affected cities.