北京蓝天日记
中国首都北京过去一周里极为难耐——污染严重，空气质量岌岌可危。一年时间里，这座城市能看见多少个空气质量还不错的天儿呢？陈子凡对话两位普通市民，他们为我们呈现了最直观的视觉证据。
Beijing’s blue-sky diary
China’s capital has just endured a week of particularly hazardous pollution. In one year, how many good-air-quality days does the city see? Chen Zifan spoke with two residents who captured the visual evidence.
