Science

This satellite tracks air pollution around the world

Press Trust of India London | Updated on January 09, 2018

A European satellite tracking the levels of air pollutants around the world has beamed back new views of the Earth’s atmosphere, including images of pollution drifting away from power plants in India.

The worst of this pollution runs from north of Patna in Bihar to south of Raipur in Chhattisgarh, scientists said.

The Sentinel-5P satellite is designed to make daily global maps of the gases and particles that pollute the air.

The first sample images released by mission scientists show plumes of nitrogen dioxide flowing away from power plants and traffic-choked cities.

S5P has even captured the ash and sulphur emissions from Agung volcano on the Indonesian island of Bali, which is in the midst of a big eruption.

Researchers from the Netherlands Met Office (KNMI) still need to complete five months of calibration work to get the satellite’s data ready for public use.

When fully operational, the new Sentinel will be an extremely powerful tool to monitor air quality, according to principal investigator Pepijn Veefkind.

“It’s been amazing to see how quickly we were able to get the satellite working. This is a big improvement on what we’ve been able to do before. In just a week, we’ve got more data out of Sentinel-5P than in several years of operation of a previous mission,” said Veefkind.

The satellite was launched into an 824 kilometre high orbit by a Russian rocket on October 13 this year.

It carries an instrument called Tropomi-a spectrometer that observes the reflected sunlight coming up off the Earth, analysing its many different colours.

This helps detect the presence of gases such as nitrogen dioxide, sulphur dioxide, methane, and carbon monoxide in the atmosphere.

Published on December 04, 2017

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