Startup offers free Wi-Fi when air is clean
Amsterdam-based startup TreeWiFi provides free Wi-Fi to people when the air around the locality is clear. Founded by Joris Lam, the startup uses 'smart birdhouses' with sensors that determine the air quality and showcases it through the attached LED system. TreeWiFi also provides tips to improve the air quality, thereby motivating people to organise car-free​ days.