There's nothing unique about China's environmental problems. Every nation in Europe was at least as dirty during their own industrial revolutions. A hundred years ago, every building in urban Britain was jet black with soot. In 1952, the great smog of London killed 4000 people and brought the whole city to a standstill. The urban pollution in modern China would be entirely familiar to any elderly Briton.
China are making great steps to remedy their environmental problems. They're a leading investor in solar, battery and nuclear technology. They industrialised faster than the west and now they're cleaning up the mess faster than we did.
https://en.wikipedia.org/wiki/Convention_on_Long-Range_Trans...