Audi's 'Urban Purifier' is a filter technology being tested that uses EVs to remove dirty particulates from the air in congested cities:
The filter system traps the finest PM10 particulates . These are the same size as the diesel particulates that all the fuss was about. But particulates of that size with a different chemical make-up are created by brakes, tyre wear, wear of the road surface and older engines, especially those without particulate filters.
So far, the filters have proved capable of extracting 100% of the particles that pass through them. Like other filters on a car, this one needs replacing only at regular service intervals, and computer modelling suggests that over the entire lifecycle of the filter system, it will collect 14.9kg of dust.
Mann+Hummel had been working on the idea on its own initiative prior to the joint project. EU figures for 2016 published by the company show that of all traffic-related dust, 27% is due to brake wear, 28% tyre wear and33% road wear, but only 12% is due to exhaust emissions. The company has already trialled a filter system that can be mounted to the roof or underside of commercial vehicles and, like the Audi system, uses fans to circulate air through them even when the vehicle is stopped in traffic. The evidence from the trials using the firm’s Fine Dust Eater test vehicles shows the filters trap as many particulates from the air as a modern petrol or diesel engine emits during the combustion process in the same time.
An alternative is a brake-dust filter that collects brake dust at source. It consists of a casing straddling the disc and mounted directly behind the calliper and acting, quite literally, as a dustbin. As the disc spins, brake dust generated by the wear of the brake pads and through disc wear is scooped up into it and collected.
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