The proverbial other shoe has been dropped.
On the heals of the EPA's report on ozone comes a report on vehicle exhaust and its possible adverse effects on the health of people living near major roadways. Not exactly a news flash - everyone knows that sucking air out of a car's tailpipe is not healthy. Not to bore you with details, but the study looked at health problems of people living near major roadways in relation to distance.
Given that fact, here is the other side of the problem with gas-guzzling behemoths. The more gas a vehicle uses, the more crap comes out the exhaust. The amount of stuff that goes into a chemical reaction (combustion in this case) must equal what come out - It is a basic scientific principle (and again I won't bore you with the details). Sure, there are filters and catalytic converters to help with some of the crud, but they don't fix everything.
So, not only are many suburban SUV drivers using more fuel than necessary on their commute to the office, but they are belching more nasty chemicals and particulates into the air than a typical compact. Air that you and I breathe. Just another reason to say fuck you and the SUV you drove in.