No your eyes aren’t deceiving you, that is an image showing an Olympic athlete running on a treadmill inside a bubble breathing in the emissions of a car.

But there’s a catch – that’s no ordinary vehicle. The car connected to the bubble is a hydrogen-powered Hyundai NEXO, which emits only water vapor.

Hyundai said its NEXO doesn’t emit contaminating particles, it emits only clean water vapor and purifies the air while driving, filtering 99.9% of the ultra-fine particles in the process.

Hyundai Motor Spain launched the extreme campaign, which features brand ambassador and sportswoman Mireia Belmonte, earlier this month to demonstrate how clean and environmentally friendly hydrogen technology is.