I'm in Northern Virginia, too. I take Nasonex, Clarinex, and a weekly injection, and the tree pollen this year seems especially bad. But not so bad that I don't run the system on auto without recirc most of the time. The filter tray is behind the glovebox, and the OEM Toyota filter is a HEPA filter. That and the plasmacluster air cleaner work in conjunction, and the interior of the Camry is the cleanest of any car I've owned in the last decade, measured by the amount of stuff that collects on the dash - virtually none.

"When you get to the fork in the road, take it." --Yogi Berra