Densely populated city of Macau with Historical landmark Walls of St Paul Church in view under hazy sky due to air pollution

macau skyline buildings climate air pollution mainland china south coast fog populous smog port public housing asia population congestion chinese poor visibility ruins sea santo antonio sar architecture climate change household residential houses dense tourist attraction cityscape urban portuguese macanese colony territory coastal islands destination tourism old city guangdong construction hotels economy walls of st paul church religious museum macao marina harbour neighborhood dangerous