I just found out about another interesting fact: the vast majority of kids are back in school by Feb 21. Here is a list of cities and their last day of winter vacation in China:
February 17: Guangzhou, Shenzhen, Tianjin, Nanjing, Changsha, Suzhou, Wuxi, Dongguan, Kunming
February 19-20: Shanghai, Wuhan, Chengdu, Hangzhou, Ningbo, Fuzhou, Xi'an, Zhengzhou, Taiyuan, Hefei, Shijiazhuang, Ningbo, Nanchang
February 24 or later: Beijing, Chongqing, Nanning, Guiyang, Shenyang, Changchun
This could mean that next week's drops are not as bad as we might think based on this week's drops. I guess we'll have to see.