Noise Abatement Ordinance
(NAO)

¹ The en­force­ment au­thor­it­ies shall in­vest­ig­ate the ex­pos­ure to ex­ter­i­or noise due to sta­tion­ary in­stall­a­tions, or or­der its in­vest­ig­a­tion if they have grounds to be­lieve that the rel­ev­ant ex­pos­ure lim­it val­ues are be­ing ex­ceeded or that this is to be ex­pec­ted.

² They shall take ac­count of in­creases and re­duc­tions in noise ex­pos­ure levels that are to be ex­pec­ted due to:

the con­struc­tion, al­ter­a­tion or im­prove­ment of sta­tion­ary in­stall­a­tions, in par­tic­u­lar if the pro­jects in ques­tion have already been ap­proved or made avail­able for pub­lic in­spec­tion at the time of the in­vest­ig­a­tion; and

the con­struc­tion, al­ter­a­tion or de­moli­tion of oth­er struc­tures if the pro­jects have been made avail­able for pub­lic in­spec­tion at the time of the in­vest­ig­a­tion.

³ …³¹