In 2009, a group of technology experts and entrepreneurs from Silicon Valley founded BeiAng in Suzhou, East China's Jiangsu province.

Their Ionic Wind air filtration technology, which is covered by more than 30 patents in countries across the world, has some advantages over traditional air purifiers.

It can clean particle matters down to 20 nanometers, a range that includes most PM2.5 particles, cigarette smoke, vehicle emissions and viruses.