Dust for photorealism

Hi all!
Could someone explain to me how I could achieve the effect from the photo below?
Dust floating in the air?

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Maybr you could scatter small dust particles with Geometry nodes and render the image with a low depth of filed value.

Or you could make a particle system that scatters dust in a volume. And add DOF & volumetric shading for some atmosphere. Maybe motion blur too.