Kathmandu's pollution has spiraled out of control so please expect to find a much dustier capital.

That's a pity. Thanks for the heads up. Will take a face mask.

I've been to Nepal a bunch of times and I usually recommend just passing quickly through KTM to get to where you are going. The dust can be terrible and it is loud and polluted - the opposite reason to why most people generally want to go to Nepal. Better to spend more time in the mountains or Pokhara

And mosquito born diseases are going around like crazy thanks to global warming.

It's winter here. That's mostly an issue during summer. Also, if you're out trekking, then that is a non-issue (especially higher up in the mountains).