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@MartinRoosli @SwissTPH @bafuCH Thanks for your efforts! Airquality has improved in 🇨ðŸ‡. How good! Even more so, my suggestion @bafuCH is to extend PM2.5 network in 🇨🇠& to introduce a 24h threshold for PM2.5 as recommended by @WHO (25 microgram/m3), as