Yesterday saw the launch of M90, an “urban breathing mask” created by the Swedish company Airinum and sold in more than 50 countries. Face masks are already a common sight in Asian countries, although the cheap washable cotton rectangles rarely perform well in tests. Surgical masks, the type usually worn by doctors, have tended to fare better – but are still largely ineffectual. The market for pricier, more attractive masks has been growing steadily in the past few years. Sales are not notable but Freka, a British brand, had the monopoly for a while. And rightly so, given that they tapped into the trend for minimal sportswear, almost Céline-like in design, seeking to become more of a background accessory than anything stand-out.