Particles colliding in accelerators produce numerous cascades of secondary particles. The electronics processing the signals avalanching in from the detectors then have a fraction of a second in which ...

The study finds that roughly one third of Delhi’s annual PM2.5 pollution is made up of these secondary particles, and their contribution rises sharply during severe smog episodes. A new analysis by ...

You can't see, feel, hear, taste or smell them, but tiny particles from space are constantly raining down on us.

A large share of India’s PM2.5 pollution is not emitted directly but is chemically formed in the atmosphere from precursor gases, with 42 per cent of the burden being secondary particulate matter, ...