Hong Kong disappeared under a blanket of filth as the air pollution index shot up on January 19,1999. According to country's Environmental Protection Department, the smog was caused by low winds and a temperature inversion
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/hong-kong-9
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hong-kong