Tiny grains of pollen are released into the atmosphere by a wide spectrum of flowers, trees, weeds, grasses and other plants that reproduce seasonally.
(Tiny grains of pollen; are released; into the atmosphere; by a wide spectrum of flowers, trees, weeds, grasses and other plants) (other plants; reproduce seasonally; )
Tiny grains of pollen other plants
are released reproduce seasonally
into the atmosphere by a wide spectrum of flowers, trees, weeds, grasses and other plants