Keep in mind that a standard pre-2009 home natural gas furnace emits ~1 oz of NOx per day (~2000 sq ft house, ~600 cu. ft of gas per day). The suspect VWs, conservatively assuming worst case of 40x the tier II limits at all times (way worse than it likely actually is), would emit ~0.5 oz per day assuming a standard 20 mile round trip commute. To extend the hyperbole of the folks assigning 'deaths' to VW's...if you haven't replaced your furnace recently you're killing twice as many people as TDi drivers. Food for perspective.