Air pollution
Combating air pollution - for iPad/Mac/PC
English - October 09, 2009 02:22 - 4 minutes - 47 MB VideoCourses Education particle filtration filter engine environment britain vehicle transport atmosphere airstream Homepage Download Apple Podcasts Google Podcasts Overcast Castro Pocket Casts RSS feed
Previous Episode: Transcript -- Air pollution
Next Episode: Combating air pollution
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 .