The drawback of using plasma technology to clean exhausts has always been the extra power required to run the system.

ECONOMIST: Diesel engines

Because hydrogen can clean the exhaust right from a cold engine start, the plasma reformer method is 20% to 50% more efficient at reducing NOx than other clean-diesel technologies, allowing less unburned fuel to pass through in the process.

FORBES: Clearing the Air

On earth, a magnetically confined plasma is what nuclear-fusion researchers wrestle with in their search for a clean source of energy.

ECONOMIST: Hot stuff