环保部：改善重污染天气 京津冀面临严指标 (Environment Ministry: China’s major cities to set strict targets to improve air pollution)
Xinhua, October 2, 2013
http://politics.people.com.cn/n/2013/1002/c1001-23098259.html
China readies air quality warning system for major cities
The Brics Post, October 2, 2013
http://thebricspost.com/china-readies-air-quality-warning-system-for-major-cities/