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Summary | 8 Annotations
沙塵暴的發源地位於甘肅、寧夏和內蒙古交界處的戈壁南緣
2017/05/05 11:29
地區的沙漠呈現擴大之勢
2017/05/05 11:29
測量PM10(直徑不大於10微米的顆粒物)的空氣質量指數高高徘徊在900到999
2017/05/05 11:30
999是空氣質量指數應用給出的讀數上限。世界衛生組織(WHO)的指南建議,該指數不應高於50
2017/05/05 11:30
數十年的濫砍濫伐和過度放牧是造成該地區沙漠化的罪魁禍首
2017/05/05 11:30
煤炭開采和發電站也是肇因
2017/05/05 11:30
中國的政策制定者已嘗試各種方法來抗擊從不斷擴張的戈壁刮來的沙塵
2017/05/05 11:30
綽號“綠色長城”的防護林帶。這條在中國北方種植起的防護林帶最終將綿延4500公里、包含1000億棵樹
2017/05/05 11:31