When in March 2019 the city experienced one of the worst air pollution days on the planet, a Chiang Mai-based engineer wanted to buy an air purifier to clean indoor air. He looked at the available products in the market and everything seemed to be quite expensive. So… being an engineer, he did some research and found out that he, together with a design partner, could develop his own air purifier. The first prototype turned out so good in terms of cleaning the air that they decided to start producing a commercial product. And the low-cost, highly efficient personal air purifier was born!