Comment by nine_k
5 hours ago
I'd say that putting off sooth clouds is a way to sequester carbon (which obviously failed to burn). Such over-enriched fuel mixes must generate much more CO though, and I wonder if those who "tune" their cars like so take care about the catalytic converter :(
The health consequences of inhaling exhaust particulates are far more harmful than the equivalent CO2 contribution to greenhouse effect warming unfortunately.
All in all, a well tuned ICE is better for everyone than a poorly tuned one, if you had to pick between the two.
I know in some car tuning circles, or even just blue collar Joes in some places, will recommend removing the catalytic converter. Supposedly it makes the car use less fuel at the cost of worse emissions, and can make it sound better for those who care about that.