'Warn Public on Health Risks of Air Pollution' South China Morning Post, August 3, 2012 http://www.scmp.com/portal/site/SCMP/menuitem.2af62ecb329d3d7733492d9253a0a0a0/?vgnextoid=d61cb369e38e8310VgnVCM100000360a0a0aRCRD