A decade of battle against PM 2.5 in Beijing
通过2008至2017年北京每日PM2.5浓度日历图，展示污染先加重后减轻的趋势，但空气质量仍低于国际健康标准，尚未取得胜利。
PM 2.5 pollution has been a major environmental concern in Chinese cities for the past decade. In order to understand how pollution has proceeded, we produced a calendar view of the daily concentration of PM 2.5 in Beijing from 2008 to 2017. The graphic shows that the pollution in Beijing intensified from 2008 to 2011 and then began to alleviate in 2012. The reduction has become more significant since 2015. However, air quality still falls below the international standard for healthy air and it is still early for Beijing to declare victory in the battle against PM 2.5 .