Koenigsegg claims that because of modern catalytic converters and improved cold starting process for their engine, there are virtually no particulate emissions:

Koenigsegg claims that because of modern catalytic converters and improved cold starting process for their engine, there are virtually no particulate emissions: https://www.koenigsegg.com/gemera/tiny-friendly-giant-engine/ https://www.koenigsegg.com/gemera/tiny-friendly-giant-engine... I wonder how well these claims will hold up. Seems like a very big deal if true.