Scent-bearing hydrocarbon molecules released by flowers can be destroyed when they come into contact with ozone and other pollutants. This phenomenon triggers a cycle in which the pollinators have trouble finding sufficient food, and as a result their populations decline. Air pollution interferes with the ability of bees and other insects to follow the scent of flowers to their source, undermining the essential process of pollination, a study by three University of Virginia researchers suggests. Their findings may help unlock part of the mystery surrounding the current pollination crisis that is affecting a wide variety of crops. Scientists are seeking to determine why honeybees and bumblebees are dying in the United States and in other countries, and the new study indicates that emissions from power plants and automobiles may play a part in the insects' demise. Scientists already knew that scent-bearing hydrocarbon molecules released by flowers can be destroyed when they come into contact with ozone and other pollutants. Environmental sciences professor Jose Fuentes at the University of Virginia