Thursday, December 20, 2018

hy cleaning the air is like taking milk out of tea

Gary Fuller
Thu 20 Dec 2018 16.30 EST


Ally Lewis, professor of atmospheric chemistry at York University, likened filtering outdoor air to “trying to air-condition a room with the roof off”. The volumes that we would need to filter are vast. For example, if you drive a typical diesel car made between 2010 and 2015 for a distance of 8km (about 5 miles), it will emit around 9g of nitrogen oxides. To remove this pollution from the atmosphere in central London you would have to scrub around 150,000 cubic metres of air – approximately the volume of St Paul’s Cathedral. It is much easier to stop the air being polluted in the first place.

• With thanks to Anna Font, King’s College London for checking the volume calculation.

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