This is crazy, but when you think about the amount of hydrocarbon and other pollution coming from just one saw being more than that produced by a late model truck, it kind of hits home (THALL referenced this in another thread recently). I remember being an asthmatic kid in Chicago in the '60's, when even the PCV valve was a new innovation. Talk about some stinkers. Rush hour on the Dan Ryan was worse than a Superfund site. It was so hard to breathe back then, and the EPA has been responsible for cleaning up the air a whole lot, but respiratory ailments among kids are still on the rise, so we have a ways to go, the main problem now being coal plants, diesels, and 2-strokes. My asthma went away years ago, but respiratory disease is still very common, and it is a direct result of air quality for the most part. So they squeeze us for wanting our saws to run right, while coal plants belch millions of tons of radioactive (that's right), sulfurous, and other combustion by-product laden smoke into the air every year. I guess the saw owners' lobby is not strong enough or rich enough to be heard in Washington.