The Düsseldorf International Airport and seven other airports in Germany have come up with a unique way of monitoring air quality;
they use bees. The airports test the bees' honey twice a year for toxins, and batches that turn up clean are bottled and given away. From the article: "Assessing environmental health using bees as 'terrestrial bioindicators' is a fairly new undertaking, said Jamie Ellis, assistant professor of entomology at the Honey Bee Research and Extension Laboratory, University of Florida in Gainesville. 'We all believe it can be done, but translating the results into real-world solutions or answers may be a little premature.' Still, similar work with insects to gauge water quality has long been successful."
