Forest Service lichenologist Sarah Jovan hardly has to walk half a block from her office in downtown Portland to find the type of shaggy, green moss she used to discover the city's hidden hot spots of ...

Air pollution is one of the world’s invisible killers. It causes seven million premature deaths a year, making it the largest single environmental health risk, according to the World Health ...

PORTLAND, Ore. — Bullseye Glass and Precision Castparts both had to put out millions of settlement dollars after they were involved in class action lawsuits regarding their air pollution levels. Those ...

England’s first pollution-busting “moss tree” has been installed in Newcastle city centre. The unusual structure, which was put up at Haymarket on Thursday, is designed to purify air in the city ...