The UK Government is offering £5 million for greener buses in a bid to cut pollution.
Bus operators in England will be able to bid for up to £50,000 of the funding to fit technologies that help reduce emissions and improve air quality.
It is open until the end of October, with a particular focus on pollution hotspots in cities and urban areas.
Transport Minister Andrew Jones said: “The £5 million Clean Bus Technology Fund will provide hundreds of cleaner buses to improve air quality in towns and cities across England.
“The funding will also support the British industries helping deliver the technology. Today’s announcement continues the government’s commitment to improve air quality by upgrading existing vehicles on the road while also backing the low-emission solutions for the future.”
So far, around 1,500 buses in England have been retrofitted with green technology.