To what level mosquitoes can fly / what happen if the mosquitoes reach 100th level in a lift and come out?

Answer 1

If you are inside of a building, and the environment inside the 100th level is the same as that of the first level, then the mosquito will still be able to fly (and bite) you.

Mosquitoes outside in the wild would not reach that height--simply because there is no need for them to go so high. They can find their goals much closer to the ground, so there is no energetic justification for them reaching such a height.

If you were to fly a batch of mosquitoes to that height and release them outside, they would probably still be able to fly, as long as it was not too cold. The only thing I can imagine would limit their abilities would be if it were too cold, or if there were not enough oxygen available to them.

Answer 2

Nothing, other then the fact that they would probably be tired.