On Sun, 29 Jan 2012 22:56:49 -0600, leonard hofstadter
wrote:

about stupid exhaust gases leaking in the house from the garage.

Seriously.

How many people run their vehicle in the garage long enough to have
any effect?

rant off

Uh, it has happened and it made the news here a few years ago. No one
killed, but a couple of people sick. There are many dumb people out
there.