报道又称，机动车数量从2007年年初的300万辆上升至2009年下半年的400万辆。
The report says that vehicle Numbers jumped from 3 million in early 2007 to 4 million by the end of 2009.
目前中国每千人保有的机动车数量只有25辆，其中小轿车8辆，这大约是美国1915年的水平。
China now has about 25 vehicles — and fewer than seven cars — for every thousand people, roughly the same level as the U.S. had in 1915.
为了找到污染物浓度和机动车数量的关系，科学家们在北京的主要路段设置了微波雷达记录每小时机动车的流量。
To study the correlation between pollutants and traffic, microwave radars have been installed at main roads in Beijing to count the vehicles on the road each hour.
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