Noise Abatement Ordinance
(NAO)

With­in one year of com­ple­tion, the en­force­ment au­thor­it­ies shall in­spect the im­prove­ments and sound­proof­ing meas­ures to check com­pli­ance with the meas­ures ordered. In case of doubt, they carry out tests to as­sess the ef­fect­ive­ness of the meas­ures.