Beijing's Chegongzhuang Xilu was packed with pedestrians and cars on Monday morning, but few people even bothered to glance at the small white box set up by the roadside. However, from the telltale pumps jutting from the top, it's instantly recognizable as an air monitoring station...

Source: China.org, http://www.china.org.cn/environment/2012-06/13/content_25633944.htm