Boaz, I have the perfect you can own the libs. Run a garden hose from your tailpipe to the inside of your vehicle and sit in while it idles for a few hours. That would surely show us there is no health risk from those gases so we can all know how stupid we are.

Actually Boaz I retract that statement. Do not do that. You will die. I meant #3 as a joke but then I remembered that you might just be dumb enough to do it.