At CERN, the European Organisation for Nuclear Research in Geneva, an international research team led by the Paul Scherrer ...

President Donald Trump's administration intends to overturn pollution rules aimed at reducing soot emissions from U.S.

PM2.5 is defined as fine particulate matter of 2.5 micrometers or less in diameter -- so small it can only be seen through an electron microscope -- but because it is so small bypasses filters in ...