As far back as 2013, the government called air pollution the “greatest daily health risk to the people of Hong Kong”.
The Environmental Bureau only began publicising Hong Kong’s PM2.5 figures in 2012, nearly seven years after it began monitoring the harmful pollutant, and only after Beijing began publishing the same information.
The Hong Kong government’s targets for annual air pollution are three and a half times higher than those recommended by the World Health Organization.
The vast majority of Hong Kong people don’t have air purifiers, and those that do tend to be wealthier and better educated, according to Peter Brar, manager at air quality testing company Renaud Air, which also sells filters.