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Roula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter.

Airinum’s founder, Alexander Hjertström, has been on a quest to battle poor air quality ever since his childhood asthma was retriggered on a trip to India in 2014. The Swedish firm’s first product, a stylish “urban” mask with multiple filter layers, initially proved popular in Asia, but word spread globally during the Covid pandemic. Since then, the threat…