URBANA, Ill. — A beam of sunlight streams into your living room, illuminating a Milky Way of dust particles hanging in the air. Although the air looks thick, those visible dust particles are so big that they can't reach the smallest branches of the respiratory tree in your lungs. It's the dust we can't see — smaller than 2.5 microns, called PM 2.5 — that can cause allergies and other respiratory problems.
Inside livestock facilities, the dust particles are much more abundant than in a living room, and can cause pulmonary problems for anyone who breathes the air. . .
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