Urban population and air pollution

== Urban population and air pollution ==
http://feedproxy.google.com/~r/MedicalNewsAroundTheWorld/~3/z6VcDsyUpg4/265030.php
(from Medical News Around The World)

Live in a large city like New York, London, Beijing or Mumbai, and you are likely exposed to more air pollution than people in smaller cities in surrounding areas. But exactly how a city's pollution relates to the size of its population has never been measured, until now. Using satellite observations, NASA scientists directly measured air pollution's dependence on population in four of the planet's major air pollution regions: the United States, Europe, China and India. The study shows that the pollution-population relationship varies by region...