26 JAN 2018: Thick smog choked Hong Kong's Victoria Harbour, hiding what on other days is an impressive spectacle of sea, hills, and skyline. Every monitoring station in Hong Kong reported dangerously bad air. Winter often brings heavy air pollution to this specially governed metropolis of southern China, but particulate matter levels on January 22 hit eight times the acceptable maximum. Officials warned children, elderly, and those with heart or lung problems to stay inside. (VIDEO)

Recent government efforts have made progress against air quality problems, but risk factors like motor vehicle traffic continue to pose a challenge.




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