Ammonia emissions from agricultural fertilizers are threatening sensitive ecosystems in U.S. national parks, a study led by Harvard researchers has found.
Thirty-eight national parks are seeing nitrogen deposition levels at or above the threshold for
NOx is a pollutant that comes from all combustion emissions. It can be minimized but not eliminated at the stack. Painted surfaces (a very common urban surface area) with photo-catalytic characteristics may be able to clean the air of nitrogen oxides and other health-endangering substances. Using a new testing procedure, Fraunhofer researchers can find out how