Maybe it makes sense that Clearlake a bucolic town in northern California has one of the few school boards in the U.S. with a Green Party member. The air in this community of 15,000 people is about as pure as it gets in the U.S. and stands in stark contrast to the smog valley of southern California. Ironically, the actual Clear Lake itself is heavily contaminated with mercury, thanks to a nearby abandoned mine. But I guess you can't have everything.