You could get one of those fancy gadgets to monitor air quality as you trundle about your neck of the woods, but if you're more concerned for the environment's well-being than your own, all you apparently need is an active beehive. Eight German airports are presently using honeybees to test the air for toxins by shipping their honey to a local lab -- and for four years running, that honey's tested just fine. Last year, Dusseldorf International Airport produced 200 jars of the stuff. We wouldn't pay extra for airport honey, mind you, but we suppose we'd give it a try...