The question how we cope with noise is one of the largest challenges for society today. This is especially true for General Aviation and the airsport. Noise is always what the others make. That is why using the actually measured noise level, which should be the basis for any impartial discussion, is not feasible.
Noise rather is a psychological problem than a scientific one.
The reduction of noise emissions of aircraft has in many cases reached the limit of technical feasibility. Only that the people who live near airfields don't know about it. An active and constant public relation work is mandatory. In Australia, huge cattle herds are driven by helicopters. The so called stock mustering has become a daily routine for the experienced cowboys in the cockpits.