Source: U.S. Environmental Protection Agency
quote: Lots of people in localities with regular exhaust system testing can tell you from firsthand experience that catalysts don't necessarily outlast the vehicle.
quote: In case my statement wasn't clear enough, I agree with you that nobody is dying from excessive SO2 inhalation from cars. Occasionally people complain about the smell. SO2 isn't the pollutant being blamed for deaths, but controlling it is the key to the claimed health benefits of this change. It's that tricky catalytic chemistry, so you have to be knowledgeable and think your way through it.
quote: P.S.- there's a subtext here for someone that hates Obama and green regulations and unions and Government Motors to pick up on if you're clever enough to spot it...... ;)