Washington Post: Those pollen grains in the air that make you miserable may have a surprising side effect: heavier rain. A new study says bits of pollen lofted into the atmosphere by springtime winds make their way into clouds, seed them and may even intensify downpours.
The study, Pollen as atmospheric cloud condensation nuclei, is the among the first to propose the idea that pollen helps enhance clouds.
The [pollen] grains were thought to be too large to be important in the climate system, too large to...