Around a hundred people in the northern Vietnamese port city of Hai Phong Monday surrounded a local chemical factory with banners accusing it of polluting the environment.
Trang Kenh factory in Hai Phong, which produces calcium carbide and other chemicals, has severely polluted the local environment for many years, resisdents told the Saigon Tiep Thi newspaper.
It has emitted thick smoky gas and a piled up waste in a dump site more than 40,000 cubic meters near local homes.
Many locals were busy setting up fences to prevent vehicles from entering and leaving the factory on Monday.
Bui Van Muop, a 58 year old local, said electric arc furnaces used to produce calcium carbide usually emitted gas that made it difficult to breathe.
Vu Thi Ly, 71, said local people have complained the air pollution many times to the factory and local authorities.
Le Van Hien, Chairman of the city's People's Committee, said the factory has been operating since 1972 and the technology as well as equipment was outdated.
The factory was working on a project worth more than VND4 billion to reduce gas emission, which will completed by the end of this year, said Nguyen Quang Lap, deputy director of the factory.