In Amsterdam, clean air gets free wifi from trees

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Fresh, clean air is one of the quickly diminishing commodities most city dwellers crave on a daily basis, and we have seen air purifying billboards and navigation apps help urbanites breathe better. Based in Amsterdam, TreeWiFi's smart birdhouses let residents know about the air quality of their neighborhood, and if it is clean enough, they get free wifi. Using nitrogen dioxide (NO2) sensors to measure the amount of combustion particles in the air, the birdhouses light up with LED lights to show real-time levels of pollution. When the lights go green, the air quality has improved, and the network makes…

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