A New Kind Of Paving Stone Being Tested In Dutch Town

The town of Hengelo is using one of its roads as a testing bed for a new kind of paving stone made from air-purifying concrete that was developed at the University of Twente.

How it works:

Experts from the University of Twente developed and tested the concrete paving stones which contain a titanium dioxide-based additive.

In laboratory conditions, the additive — under the influence of sunlight — binds the nitrogen oxide particles emitted by car exhausts and turns them into harmless nitrates.

“With one rain shower everything is washed clean,” the institution said in a statement.

Nitrogen oxides, produced by industry and motor vehicles, are among the main air pollutants that lead to acid rain and smog. — Physorg.com