It's long been known that vehicles using old diesel engines cause a high proportion of Hong Kong's roadside pollution. This was confirmed by the release of Hong Kong's 2010 Air Pollutant Emission Inventory recently. It revealed that a relatively small number of old diesel-engined vehicles were causing a relatively high amount of roadside pollution.
via Business feed http://www.scmp.com/business/article/1075673/dirty-diesel-engines-obvious-target-epd
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