Noise Abatement Ordinance
(NAO)

¹ For build­ings, noise ex­pos­ure levels shall be de­term­ined at the centre of open win­dows in rooms sens­it­ive to noise. Noise ex­pos­ure levels due to air­craft may also be de­term­ined in the vi­cin­ity of the build­ing.⁴⁰

² In the non-de­veloped sec­tor of zones with high­er noise abate­ment re­quire­ments, noise ex­pos­ure levels shall be meas­ured 1.5 m above the ground.

³ In build­ing zones that have not yet been de­veloped, noise ex­pos­ure levels shall be meas­ured at points where the build­ing and plan­ning le­gis­la­tion al­lows the build­ing of rooms sens­it­ive to noise.