The clean air of Anchorage?

I wish scientists would make up their minds.  On the one hand, Anchorage comes in as the 8th cleanest city for breathable air. On the other hand, we have some of the highest pollen counts in the world for people who suffer from allergies. So from what I can gather from these facts, we are breathing in the cleanest possible pollen on the planet.  Yea us! Now pass the Zyrtec.