> Maybe it was psychological. I assure you it's not. My region of the world, previously covered in PMs of every size each winter, is weirdly clean this year.

> Maybe it was psychological. I assure you it's not. My region of the world, previously covered in PMs of every size each winter, is weirdly clean this year. The difference is palatable. As in, smog of this level normally leaves an actual aftertaste.