Zero local emissions in everyday operation, instant accelerating power, superior long - distance comfort. (topspeed.com)
He adds that advanced countries need to strive for sustainable consumption and help developing countries adopt advanced pollution control technologies, whereas developing countries need to take action to reduce local emissions. (sciencemag.org)
I would think running a catch can set up would prevent this (local emission standards would need to be researched) obviously I speak of cars out of warranty. (humblemechanic.com)