Four wheel drive tax

So, I was driving down Northbourne Ave the other afternoon. Windows down, being summer and all, I stopped at some traffic lights.

Lights go green, and I basically choke to death from the fumes expelled by the two four wheel drives on either side of me.

Why doesn't the Government do anything about this?? Why isn't there some regulation/legislation stopping disgusting gas guzzling four wheel drives from spewing toxic fumes into my air?

Four wheel drives (actually, all vehicles that spew fumes) should be charged an extra "pollution tax". And this tax should go towards providing air conditioners for cars without air conditioning.

Or alternatively, the tax should be so high that consumers seriously reconsider whether they need a four wheel drive. This tax should be paid yearly (probably in the form of Rego), so they feel the pain on a regular basis.