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| Episode Description |
| Wednesday, Oct 31, 2012 - 12:00 AM
"Atmospheric Pollution"
Once released, air pollutants react chemically with each other under solar radiation to become even more dangerous secondary pollutants. A company in the Northeast U.S. tracks the emission of pollutants at street level, while an international long-term study follows plumes of pollution from Mexico City across the continent and beyond. D
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