http://www2.macleans.ca/2010/08/19/a-road-that-cleans-the-air/
Adding a coating of titanium dioxide to concrete roads. With the help of sunlight this natural photocatalytic chemical removes nitrogen oxides. It turns pollutants that comes from cars into nitrates and they get washed away by rain. Titanium dioxide also breaks down dirt so the roads can stay cleaner. This chemical is being used in some countries to help remove pollution but other countries have yet to use this chemical is actually not very harmful or expensive and should be used to help fight pollution in our cities.
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