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Stories about: nitrates

Titanium Dioxide in Pavements Cleans up NOx Pollution Concrete or asphalt containing titanium dioxide can actually clean up the air as cars travel over the surface. 25 to 45 percent of nitrogen oxides from vehicle emissions are removed, according to a research team at the Eindhoven University of Technology in the Netherlands. They also say that this material costs only ... 7 July 2010 07:02 GMT Detecting Past Comet Impacts on Earth Over the years, as scientists browsed satellite data or took to the field, numerous comet and asteroid impact sites have been discovered on the surface of our small planet. But experts believe that many more may still be out there, unknown to Science. Finding them is very important, because they could provide a windo... 14 December 2009 14:11 GMT