That 4.5 and 2.5 is only particulate matter emmisions. So co2 doesn't enter into it at all. And untill recently we had been slowly reducing emmisions from vehicles. But that was ended.At a bit of a tangent, but is anyone else a bit bewildered by the EPA's focus on stove emissions?
I'm all for effective environmental regulations, and when I was recently stove shopping I initially thought I'd definitely go for the cleanest stove possible. Then I realized that a decrease from 4.5 to 2.5 g/hr is obviously 2 g/hr, or 48 grams per day if burning 24 hrs/day.
Per the EPA, the average passenger car emits 411 grams of CO2 per mile, so that reducing one mile of driving accounts for more than a week's worth of reduction in stove emission from this new regulation.
I get that we don't want people burning tires in outdoor boilers and such, but worrying about exactly how clean modern stoves are burning while allowing unlimited driving seems to be a matter of misplaced priorities.