HONG KONG (Reuters) - Visibility in Hong Kong has deteriorated so sharply over the last 50 years because of air pollution that variations in levels can even be used to predict mortality rates, health experts warned on Wednesday.
Visibility is now 12.6 km (7.8 miles) on an average day, well below that of cities such as Paris, Berlin, Auckland and Vancouver, where visibility stands at 20 to 25 km or beyond.
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