Not Your Typical Brick

Bricks are also being marshaled to fight global warming.

This month, the doped bricks were installed as paving stones on a city street in the town Hengelo in the eastern part of The Netherlands. When car exhaust washes over the bricks, the harmful nitrogen dioxide reacts with the titanium in the presence of sunlight. Instead of being emitted into the air, the noxious gas is oxidized, turning into powdery nitrates, which are benign, naturally occurring compounds that rain easily washes away. Since cars burp the most emissions when accelerating or stopping, the researchers propose laying the bricks at busy intersections.

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