Daily Air Pollution Index的意思|示意

每日空气污染指数 There has been some suspicion Beijing cooked the books by prohibiting researchers from taking pollution readings at the site of the games and releasing only an official 'daily air pollution index.' The researchers tried to compensate for that by examining pollution readings taken by National Aeronautics and Space Administration satellites which crossed China twice a day. The NASA readings generally confirmed what the Chinese government was reporting.