New buildings in Seoul will require fine dust ventilation system from next month

Starting next month, the Seoul government will install mandatory ventilation systems.... that can filter up to 95 percent of fine dust will in new buildings here in the capital.
The Seoul Metropolitan Government has announced a revised bill on "Design Standards for Green Buildings" and said.... all new, enlarged and remodeled buildings with over 500 square meters of total floor area... will be required to have the system starting February 24th.
It added that... such is to filter fine dust that enters the buildings... and to also reduce fine dust produced by the buildings for a cleaner indoor environment.