Tesla placed a Model X inside a bubble filled with "extreme levels of pollution" at 1,000 µg/m3 of PM2.5, which the Environmental Protection Agency describes as the kind of pollution that "pose the greatest health risks." For comparison, PM2.5 levels in Beijing can hit 300 µg/m3.
In less than two minutes, the HEPA filtration system was able to reduce the level of contamination from "extremely dangerous" to "undetectable." Like the the Falcon wing doors, the HEPA filter will be as important and highly valued in polluted cities like Beijing (Source:CNET.COM)
