• Electric-vehicle concepts are common enough these days that you need more than a zero-emission powertrain to stand out. So why not work on a negative-emission EV?
  • That's what Heatherwick Studio did with its Airo concept, which uses a HEPA filter under the car to filter out pollution from other cars on the road. The Airo has been on display at the Goodwood Festival of Speed this week.
  • Hyundai has similar air-filtering technology on its Nexo hydrogen fuel cell vehicle, but there the filter does double duty by cleaning the air that the fuel-cell stack needs to operate.

    A motor vehicle with negative carbon emissions has, until recently, been basically impossible. Sure, electric vehicles have no local tailpipe emissions, but to actually reduce the amount of carbon in the air as you drive is no small feat. Hyundai says its Nexo hydrogen fuel-cell CUV actually cleans the air it moves through, since the car's fuel-cell stack needs purified air. The car accomplishes this by using a special filter that removes microparticulates from the incoming air, and that means the exhaust (such as it is) is cleaner than what was taken in. The car can even display the amount of CO2 removed.

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