Apr 20, 2026 Yul So www.koreatimes.co.kr Seoul has reduced the brightness of most large outdoor digital billboards as part of a citywide effort to save energy and reduce light pollution. According to the Seoul Metropolitan Government, about 79 percent of inspected billboards have already adopted the new brightness guidelines. The city reviewed 200 outdoor screens larger than 30 square meters. Among them, 158 sites had lowered brightness levels or introduced automatic control