Actually, not quite true. There has been a massive leap in fuel treatment with Nano technology, and now XSNano added to fuel can reduce emissions up to 98%. It can also reduce fuel consumption and give added power to engines. So now all vehicles can run clean with XSNano added to their fuel see lubricationsolutions.com.au for more details or research XSNano in your own part of the globe. We can all run cleaner now and save money doing it.
Um. NOx. But CO2 is a harmful emission, too.