Pollution

  1. Health & Medicine

    Even ‘safe’ air pollution levels may affect heart health

    An imaging study found early signs of coronary artery disease in people in Canada breathing air that regulators consider clean.

    By Isha Ishtiaq
  2. Earth

    Decades of dumping acid suggest acid rain may make trees thirstier

    Acidified soil loses calcium, which can affect trees’ ability to hang on to water.

    By Carolyn Wilke
  3. Tech

    Tiny magnetic coils could help break down microplastic pollution

    Carbon nanotubes designed to release plastic-eroding chemicals could clear the long-lasting trash from waterways.

    By Maria Temming
  4. Particle Physics

    How a 2017 radioactive plume may be tied to Russia and nixed neutrino research

    A botched attempt at producing radioactive material needed for a neutrino experiment may have released ruthenium-106 to the atmosphere in 2017.