China suffers from a terrible air pollution problem. Professor Yi Cui of Stanford came up with an air filter for people who live in heavily polluted cities. The air filter is made out of polyacrylonitrile, or "Pan," which makes up surgical gloves. Cui and his team found out that pan easily captured small pollutants.
Contemporary air filters that can capture particle matters as small as 2.5 microns use a lot of energy. Cui's air filter can capture them without using any energy. Using a technique called electro-spinning, they were able to create thin strands of pan. The fibers attract and accumulate particles and is able to capture up to 10 times its weight.
This efficient and simple air filter could be the solution to China's air pollution!