China National Petroleum Corporation

Residents wearing masks hold posters with slogans including 'PX get out of Kunming' as they protest against a planned refinery. Photo: Reuters

Kunming residents rally against chemical plant

Hundreds protested in Kunming, Yunnan province, but a march in Chengdu, Sichuan province, was prevented by police. The rallies were timed to coincide with the anniversary of the May 4 student demonstrations in Beijing in 1919.