Jak jest poprawnie: in low level czy at low level?

high/low level "At the moment, public interest is at a high level." (zainteresowanie jest na najwyższym poziomie

poziom (piętro) "Didn't we park the car on Level 2?"

way of understanding a way of considering or understanding something
on ... level
The story can be understood on many different levels.
on a personal/practical/superficial etc level
I agree with you, but only on a theoretical level.

odnośnie poziomu wiedzy: "Students at this level may have problems with basic grammar."

http://www.ldoceonline.com/dictionary/level_1) - niestety ,jest z tym różnie...