Professor Lewis’s analysis of ways to tackle air pollution (10 ways to beat air pollution: how effective are they?,, 15 February) is disappointingly dismissive of technology that can work in bus shelters or other pollution hotspots. While these solutions can’t clean an entire atmosphere, there are places where they can make a huge difference and it would be shortsighted to sweep them aside.

Tests at King’s College London have independently verified that our technology can clean the air of dangerous and pervasive nitrogen dioxide and particulate matter in pollution hotspots. It can reduce exposure to pollution in bus shelters, tube stations, and potentially hospitals or schools, by up to 80%. The mixing of the atmosphere does not therefore “completely outweigh the benefits” as Professor Lewis claims.}
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