Nest

A new solar-powered catalyst made of graphene and titanium dioxide nanoparticles can pluck pollutants out of the air, much more efficiently than others. The catalyst could be coated onto building or street surfaces to improve air quality in cities.

Nest has unveiled a bunch of new smart home products at a press event in San Francisco, including a wireless video doorbell called Nest Hello, an outdoor version of its Nest Cam IQ, and a comprehensive security system for protecting your home named Nest Secure.