Alastair Lewis, science director at the National Centre for Atmospheric Science, University of York, writes about how in spite of some clever marketing, air pollution filters may not be the golden bullet for poor air quality.

I recently found myself in the surreal world of the Consumer Electronics Show in Las Vegas discussing the next generation of pollution sensors that one day you might find inside your phone. The exhibits I saw suggested the next big thing in home technology could be anything from intelligent cat litters to internet-enabled teapots, with everything powered by mysterious machine learning and the unfathomable blockchain.

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