Hot weather, heavy rainfall, pollution from the Pearl River and other unknown causes have been blamed for one of the worst declines in the quality of marine water last year.
The cumulative affect of air pollution from new infrastructure proposed for Tung Chung - including a HK$136.2 billion third runway - could be up to 50 per cent higher than a legal limit that may come into effect this year.
Hong Kong should ask itself if it wanted to keep its reputation as the Pearl of the Orient when it considers imposing more regulations to fight light pollution.
