The global economy thrives on the constant exchange between countries. As more nations become industrialized, however, they are creating an unintended new export: air pollution. For years, scientists have observed belts of air pollution traveling on wind currents, following weather patterns, and crossing oceans and continents. However, determining where air pollution originated is not as easy as reading a clothing tag or a fruit label. A study analyses data from a new satelitte mission, the Tropospheric Emission Spectrometer (TES) instrument, launched aboard NASA's Aura satellite in July 2004 to detect pollution drift patterns as well as reveal ozone sources.

Read more: http://nasadaacs.eos.nasa.gov/articles/2006/2006_ozone.html