They are not only nice to look at, but plants could also help clean up the polluted air in our cities. <br /><br />In Lyon, one of France's largest and most polluted cities, tests have been carried with vegetal walls in various sites, including at highway toll booths and underground car parks. <br /><br />On the deck of the Perrache railway station car park, there are 12 columns of vertical planting. <br /><br />...<br />http://www.euronews.net/
