EarthThese strange lines of cloud are seeded by pollution from ships Much as an aeroplane leaves contrails, streaks of white cloud condense onto the tiny particles thrown into the air by the exhausts of travelling ships Regulars
PhysicsGood news: one form of air pollution may be falling in Europe Levels of nitrogen dioxide in European city air rose throughout the 2000s but seem to have reached a peak in 2010 – suggesting Europe might get cleaner air sooner than expected News