The white pine pollen has been so thick here at Sebago Lake Maine , that it not only leaves an obvious residue on the surface of the water and even on granite outcrops bordering the lake, but it's evident in the air too. Like minute cloud droplets pollen grains are of just the right size range (about 10 - 100 microns in diameter) to deflect Sunlight is scattered by the pollen grains in such a way that the spherical waves (light behaves as both a wave and a particle) overlap and interfere with one another, resulting in concentric colored rings -- a corona . Of course, never look toward the Sun without protection your eyes