Smog hangs over Hong Kong’s skyline. To improve air quality and health in Hong Kong and the rest of China, all efforts need to be geared at reducing criteria air pollutants such as carbon monoxide, lead and nitrogen dioxide. Photo: EPA

Letters to the editor, December 9, 2015

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Smog hangs over Hong Kong’s skyline. To improve air quality and health in Hong Kong and the rest of China, all efforts need to be geared at reducing criteria air pollutants such as carbon monoxide, lead and nitrogen dioxide. Photo: EPA
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