Biodiesel combined with gutter oil and diesel will be offered at nearly 200 gas stations in Shanghai by the end of the year, local authorities have said.

The biodiesel is 5 percent processed gutter oil and 95 percent diesel.

"Such biodiesel is now available in 21 pilot gas stations in Shanghai. More than 2,000 vehicles are now using this kind of biodiesel everyday," said Xu Kunlin, deputy mayor of Shanghai.