“Air quality in China is notoriously poor and recently has become an issue associated with increasing social unrest. Ambient concentrations of total suspended particulates (TSPs) between 1981–2001 were more than double China’s National Annual Mean Ambient Air Quality Standard of 200 μg/m3 (1) and five times the level that prevailed in the United States before the passage of the CleanAirAct in 1970. Furthermore, air quality is especially poor in
Northern China, which is home to several of the world’s most polluted cities (2). Following a career in the Southern China city of Shanghai, Premier Zhu Rongi reportedly quipped in 1999: “If I work in your Beijing [in Northern China], I would shorten my life at least five years” (3).

以前读PNAS，都是生命科学方面的文章，从没想到还有经济社科方面的，真是汗~~~。
原来社科是这样写SCI的：“某某某什么时候发表过什么什么感想”，继续汗~~~。

擦擦汗，继续看看有哪些新汗点。。。