Air Pollution - for iPad/Mac/PC podcast

Transcript -- Air Pollution

0:00
NaN:NaN:NaN
Rewind 15 seconds
Fast Forward 15 seconds
Transcript -- Keeping watch on the invisible. The Clean Air Act banished smog from our cities in the 1950s, but today there are new types of air pollution .

More episodes from "Air Pollution - for iPad/Mac/PC"