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Can Concrete Purify the Air?

Posted by John on August 9th, 2008

That’s the question on the minds of citizens in the Dutch town of Hengelo, where officials are paving a road with a special type of air purifying concrete to curb nitrogen oxide pollution from vehicle exhaust.

Engadget reports that the concrete bricks contain a titanium dioxide additive which, when exposed to sunlight, binds with nitrogen oxide particles and breaks them down into “harmless nitrates” that wash away with water. Continue reading