This portable air filter is like a Brita for your personal space
Raymond Wu stepped off the plane in Beijing, China, after his first semester of college in the US and entered a thick cloud of fog. At least, he thought it was fog. It smelled “faintly of car exhaust and scorched metal,” and blanketed the vehicles in the parking lot with dust. It turned out to be pollution. And the crisis stretched far beyond China’s walls. The experience later inspired Wu to quit his job as a tech investor and invent a personal...