Reply To: Airborne particulates in Hong Kong – health risksHome Concrete and Conservation Pollution Airborne particulates in Hong Kong - health risks No title 1 November 2006 at 6:23 pm #7982 DocMartinI’ve done an article on the site, On smoggy days, can we clean the air indoors? – seems that using air purifier with a HEPA (high efficiency particulate air) filter could be worthwhile.