Officials in a southwest Chinese city have decided to make an environmental assessment of a planned refinery public following protests over health fears.

Hundreds of people concerned about potential air and water pollution protested in Kunming city in Yunnan province in mid-May over the refinery planned by powerful state company PetroChina.

The official Xinhua News Agency quoted the city's mayor as saying Sunday that details of the environmental evaluation report would be released to the public. Li Wenrong said the city government would listen to comments and suggestions from residents.

Officials had previously said the report would remain confidential, aggravating a public already upset with a lack of information about the project.

The oil refinery is slated to be run by China National Petroleum Corp.