Noise Abatement Ordinance
(NAO)

¹ Noise emis­sions from new sta­tion­ary in­stall­a­tions shall be lim­ited as dir­ec­ted by the en­force­ment au­thor­it­ies in­so­far as:

a.

this is tech­nic­ally and op­er­a­tion­ally feas­ible and eco­nom­ic­ally ac­cept­able; and

b.

the noise ex­pos­ure level res­ult­ing from the in­stall­a­tion alone does not ex­ceed the plan­ning val­ues.

² The en­force­ment au­thor­it­ies shall re­lax the re­quire­ments in cases where com­pli­ance with the plan­ning val­ues would place a dis­pro­por­tion­ate bur­den on the in­stall­a­tion and there is an over­rid­ing pub­lic in­terest, par­tic­u­larly re­gard­ing ques­tions of spa­tial plan­ning. The im­pact thresholds must not, however, be ex­ceeded.⁶

³ In the case of new air-to-wa­ter heat pumps that are primar­ily used for space heat­ing or for heat­ing drink­ing wa­ter and whose noise emis­sions do not ex­ceed the plan­ning val­ues, fur­ther emis­sion lim­it­a­tion meas­ures in ac­cord­ance with para­graph 1 let­ter a shall only be taken if a lim­it­a­tion of emis­sions of at least 3 dB can be achieved with no more than one per cent of the in­vest­ment costs of the sys­tem.⁷