sentences:  The restrictions resulted in an average Beijing PM2.5 concentration of 19.5 μg/m3, the lowest that had ever been on record in the capital.China's strategy has been largely focusing on the development of other energy sources such as nuclear, hydro and compressed natural gas.The latest plan entails closing the outdated capacity of the industrial sectors like iron, steel, aluminum and cement and increasing nuclear capacity and other non-fossil fuel energy.