That scenario already faced challenges: Whereas small particles can stick electrostatically, it's harder to explain the formation of meter-sized objects, which don't exert much gravity.

Nanoparticles can become electrostatically charged, which would impart the same property to the soil, perfectly accounting for its tendency to float.

They are made of layers of polypropylene plastic, electrostatically charged to attract and hold contaminants like dust but not gases or oils.