ANSI/ASA S12.9-1998 (R2003)

Vendor Note: This standard provides guidance on the compatibility of various human uses of land with the acoustical environment. This Standard uses the yearly average total day-night adjusted sound exposure or the yearly average adjusted day-night average sound level to characterize the acoustical environment. Yearly average total day-night adjusted sound exposure and yearly average adjusted day-night average sound level are defined in Part 4 of ANSI 12.9. An informative annex provides guidance to local authorities for designation of land uses compatible with existing or predicted yearly average total day-night adjusted or non-adjusted sound exposure or predicted yearly average adjusted or non-adjusted day-night average sound level. Ranges of the yearly average total day-night adjusted sound exposure or yearly average adjusted day-night average sound level are outlined, within which a specific region of compatility may be drawn by local authorities. These ranges take into consideration the difference in sound level from outside to inside buildings as commonly constructed in that locality and living habits there.