[WolfpackS2k]

Originally Posted by Yardjass

To be fair, 99% of road wear is caused by heavy trucking. That's the real villain if you want to talk about a free ride, not a small number of light passenger cars that are avoiding a couple hundred dollars in road taxes every year.






I'm not talking about C02 and water vapor. I'm talking about particle size. The "black soot" that you can see is what everyone makes a big deal out of but it is relatively easy for the lungs to clean out, if they even make it there to begin with without being caught by mucous or nostril hairs.


Also, a gasoline engine does not emit only what you listed. It isn't by coincidence that a large percentage of the compounds they emit are the same or similar to the air that they suck in to begin with. However, it is a non-argument to assume that because what went in came back out (which has to happen by the way), that nothing else came from what was injected in from the fuel lines. Assuming that the product as a whole is safe to breathe because it is mostly made up of the same compounds as clean air is similarly flawed.

Particulate matter (PM), also known as particle pollution, is a complex mixture of extremely small particles and liquid droplets that get into the air. Once inhaled, these particles can affect the heart and lungs and cause serious health effects.

Straight from the EPA's website on the subject: https://www.epa.gov/pm-pollution

I will admit that direct fuel injection has changed the game a bit for gasoline engines. Makes them more like diesel engines, with actual soot being produced in small amounts (compared to diesel) but greater than a conventional gasoline engine. Hence the black soot seen around exhaust pipes of lots of new cars owned by lazy drivers (that don't wash their cars). My previous comments didn't really apply to them.