This is definitely untrue for me.

The optimal level for creative thinking, Mehta found, is 70 db—about the level of a crowded café. Or traffic in midtown Manhattan.

That is unbearably cacophonous to me. Cannot think or get any creative work done at all. Might as well be inside a jet engine.

My ideal noise level is in a quiet countryside (40ish decibels) with maybe some bird calls. Gain 30 IQ points immediately.