South China Morning Post
> You're choking: Where particulate matter comes from
You're choking: Where particulate matter comes from
Monday, 24 March, 2014, 2:39pm
Air pollution has long been a problem in Hong Kong, particularly the heavy smog that always seems to linger in the winter months. Here we examine how the tiny pollutants affect our health.
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Nov 23rd 2014, 9:06am