SHANGHAI — A huge demonstration against a planned waste incinerator in one of eastern China’s biggest cities turned violent on Saturday with protesters overturning and setting fire to police cars, leaving at least 10 demonstrators and 29 police officers injured, according to Xinhua, the official state-run news agency.

The authorities in the city of Hangzhou said on Sunday that they had cleared an expressway that was blocked by the rally a day earlier, and that 700 officers had been deployed there to maintain order. A city official also said that construction on the incinerator, in the city’s Yuhang district, would not go forward without public support and proper legal approvals.

The protest is the latest indication that China’s increasingly affluent residents are willing to challenge the government on health and environmental issues. Over the past few years, similar demonstrations have taken place in Shanghai, Shenzhen and other major cities aimed at halting the construction of chemical factories or waste incinerators that residents believe will threaten the health and safety of their families.

China’s state-run news media said 18 people were arrested last month in another large demonstration against a chemical plant in the city of Maoming, in southern Guangdong Province.