Apart from putting NADP procedures in practice, I think airports should be careful with the noise levels passengers are exposed to.
For instance, there are airports where passengers walk to the airplanes that are closer to the terminal. Does anyone take into account that these passengers are exposed to dangerous noise levels? Does anyone think that while personnel working on the platform is provided with noise protection (high attenuation earmuffs at least) passengers are not?
I think there is room for improvement in the field of noise protection and noise attenuation at and around airports.