绿色和平组织揭露中国工业磷肥污染严重 (Greenpeace Exposes Serious Pollution of Industrial Phosphate Fertilizer in China)
Radio Free Asia, April 02, 2013
http://www.rfa.org/mandarin/yataibaodao/huanjing/hf-04022013152121.html
北京一季度天气史上较差 环保局长释因 (EPA Official: Air Pollution Worsens in Beijing, Coal and Oil Burning Prime Cause)
Beijing Daily, April 03, 2013
http://bj.people.com.cn/n/2013/0403/c82840-18399313.html
Related:
Beijing's Major Air Pollutants Up Almost 30 percent in First 3 Months of 2013
The Economic Observer, April 03, 2013
http://www.eeo.com.cn/ens/2013/0403/242156.shtml