Carbon black is that grime that otherwise lodges in your pretty pink lungs, and it's associated with. It's not good stuff, and it's from inefficient combustion, not from combustion itself.
El cabrón negro es ese hollín que si no se aloja en tus hermosos y rosados pulmones, y está asociado con... No es nada bueno, y es una forma de combustión ineficiente, no de la combustión misma.