Noise Abatement Ordinance
(NAO)

¹ Where a sta­tion­ary in­stall­a­tion that already ex­ists when this Or­din­ance comes in­to force is mod­i­fied, the noise emis­sions from the new or mod­i­fied parts of the in­stall­a­tion must be lim­ited as dir­ec­ted by the en­force­ment au­thor­it­ies as far as this is tech­nic­ally and op­er­a­tion­ally feas­ible and eco­nom­ic­ally ac­cept­able.⁸

² If the in­stall­a­tion is sig­ni­fic­antly mod­i­fied, the noise emis­sions from the in­stall­a­tion as a whole must be lim­ited at least to the ex­tent that the im­pact thresholds are not ex­ceeded.

³ Con­ver­sions, ex­ten­sions and op­er­a­tion­al changes car­ried out by the per­son re­spons­ible for the in­stall­a­tion con­sti­tute sig­ni­fic­ant modi­fic­a­tions to sta­tion­ary in­stall­a­tions if it is an­ti­cip­ated that the noise ex­pos­ure level will rise per­cept­ibly as a res­ult either of the in­stall­a­tion it­self or of the in­creased de­mand on ex­ist­ing trans­port fa­cil­it­ies. The re­build­ing of an in­stall­a­tion con­sti­tutes a sig­ni­fic­ant modi­fic­a­tion ir­re­spect­ive of the cir­cum­stances.

⁴ If a new sta­tion­ary in­stall­a­tion is mod­i­fied, Art­icle 7 ap­plies.⁹