Wei Xidong tells about severe air pollution in Yinglung Pass.

The Miasma is a bigger problem than I thought...

The Blight pollutants undergo endless loops of precipitation and sublimation in the air. They keep moving around ... and their distribution is extremely uneven.

They're severely hindering the purification efficiency of my Xiranite rain. The amount of precipitation must be commensurate with the levels of air pollution. If we fail to do this, we'd...

We'd ... what?

The science is a little hard to explain... Here. This is the simulation data I got.