Microscopic organisms and particles suspended in the air, including bacteria, spores, pollen, and tiny insects that drift through the atmosphere.
From 'aero-' + 'plankton' (drifting organisms). Scientists adapted the aquatic term to describe atmospheric drifters in the early 20th century.
The air around you literally swarms with billions of aeroplankton—bacteria, fungal spores, and pollen particles—so every breath you take is a universe of microscopic life!
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