The wealthy (who do most of the polluting) will push any extra cost in taxes onto consumers and then continue polluting. The only way that a tax would help at all is if it were so expensive that many people were forced to stop driving and even then the usefulness is reduced by the fact that major polluters often have plenty of money and will insist on pushing any extra costs to them onto others. That means no reduction in the number of semi-trucks on the road, no reduction in, or penalty for, the pollution they cause, and the consumers getting sick by the dust are now also getting screwed by higher prices.