Pollution monitors often collect particulates that measure 10 micrometres across, known as PM10s, as well as the smaller PM2.5s.

BBC: Railway tracks

Together, these researchers have found a way to measure the amount of light pollution around using satellite data, thereby creating the world's first atlas of light and darkness.

ECONOMIST: Going, going, nearly gone

Through a spectacular racing boat, RACE FOR WATER aims to promote innovation with universities by developing tools and systems to measure the water footprint and micro-plastic pollution in the oceans.

UNESCO: EDUCATION

Located remotely from other sources of air pollution, Mauna Loa is commonly considered one of the most reliable places to measure concentrations of gases in the atmosphere.

FORBES: Atmospheric Carbon At All-Time-High