Building water filtration plants could significantly help restoring the environment and provide the city clean drinking water.
Also, lowering emissions by possibly enforcing that only certain cars can drive on certain days. Like it could alternate from cars with odd license plates driving on one day while even license plates drive the next.
Or to educate the youth about this problem. If Linfen could educate kids about this problem, they can grow up to find new and better ways to create a greater city.