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In 2021, further evidence emerged to suggest that air pollution — specifically, fine particles of matter in the air that have a diameter of smaller than 2.5 micromoles — can lead to dementia.—Mac Stone, Discover Magazine, 11 May 2023 One micromole is equivalent to 1 million photons of light per second that is capable of being absorbed for photosynthesis.—Good Housekeeping, 28 Mar. 2023
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