·2,447,543篇论文数据，部分数据来源于NoteExpress
根据中国和美国官方公布的数字，2004年，北京大气中的可吸入颗粒物浓度是纽约的6倍多，二氧化硫浓度是纽约的两倍多。
In 2004, levels of airborne particulate in Beijing were more than six times as high as in New York, and sulfur-dioxide levels were more than double, according to Chinese and U.S. government figures.
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