Particles with diameters less than one micrometer can remain suspended in the atmosphere for several weeks.

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Particles with diameters less than one micrometer are referred to as fine particles or PM1. These particles can remain suspended in the atmosphere for several weeks due to their small size and low settling velocity. This makes them more likely to be transported over long distances, leading to potential health and environmental impacts.

Particles with Diameters Less Than One Micrometer Can Remain Suspended