Ok Guys, It's so easy, lets see you do it. You've not included a single data point to support your assertions.
~~Philip asserted that current cars create 1% of the polution of pre-smog cars and that they are clean enough. This implies that the average automobile, including light trucks and SUVs polute just 1/100th of what the average was before polution controls were introduced.
So, pick your starting point (specify the date) and list all your sources. Make sure that you DON'T use allowed emissions levels, but instead use measured averages (both mean and weighted). Compare against the same information for all current passenger vehicles. List all formulas used in your calculations.
Don't forget to include all categories that the EPA currently measures, such as NOX, HC, CO, etc. You fail if you only find partial data.
Oh, BTW, try to do it without insulting or belittling anyone or any group.
Good luck. I look forward to seeing how an expert will show why our pollution controls are as good as they need to be.
Daniel