A University of Virginia study indicates that continuous air pollution causes the scent molecules to travel less distance and as result the insects can not follow the scent trail and pollination rate diminishes. Science Daily reports:
..."The scent molecules produced by flowers in a less polluted environment, such as in the 1800s, could travel for roughly 1,000 to 1,200 meters; but in today's polluted environment downwind of major cites, they may travel only 200 to 300 meters," said Jose D. Fuentes, a professor of environmental sciences at the University of Virginia and a co-author of the study. "This makes it increasingly difficult for pollinators to locate the flowers."...
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