LAGEO,;
Institute;
of;
Atmospheric;
Physics,;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100029,;
China;
Graduate;
University;
of;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100049,;
China;
Beijing;
Municipal;
Environmental;
Protection;
Bureau,;
Beijing;
100044,;
China;
北京2008年奥运会; 二氧化氮; 柱密度; 卫星测量; 空气污染; 游戏质量; 北京地区; 对流层;