We are already seeing the Chinese air pollution go down in the data. It's still insanely high, but the peak was reached ~2015 (I think) and decreasing very slow

We are already seeing the Chinese air pollution go down in the data. It's still insanely high, but the peak was reached ~2015 (I think) and decreasing very slowly. They actually reached a regime where more reduction can increase the pollution because some pollutants react destructively with each other (eg VOCs, O3, NOx).