This may be the LEED certified Buildings requirement.

送交者: runlikeforest 于 2010-04-23, 15:41:17:

回答: 抽根烟，会要被撞死的。由 psychina 于 2010-04-23, 14:31:15:

Certain distance is required by US Green Building Council(USGBC) for the smoking areas.