Hong Kong skies get clean report card

Air pollution in Hong Kong, which touts itself as Asia's World City, not only affects locals but also makes it less attractive to expatriates, eroding its claim to global relevance, research has shown.

Human resources consultancy ECA International ranked Hong Kong last month as the 28th most livable city in Asia for expats, out of more than 480 locations. Its long-term rival, Singapore, was in first place.

The report was based on multiple factors, including climate, housing and utilities, but pointed out that air quality and pollution were holding Hong Kong back from climbing the ladder.