A Dictionary of Dream Symbols
by Eric Ackroyd(2) A person covered with dust will probably be you, in which case you need rejuvenating. Perhaps you are too much under the sway of the past and need to dissolve old resentments and turn receptively to the future (or, rather, to the present) and to your inner self, to see what each of them is offering you.
(3) Dust may be a symbol of death or mortality. But it may be that you feel dead, in which case, see (2) above.
See also Dead / Death.
The Big Dictionary of Dreams
by Martha ClarkeDreaming of dusty objects is also a symbol of abandonment and neglect.
It is evidence of the rejection of that which you haven’t even touched in a while. This may include aspects of yourself you are not aware of or have forgotten. Similarly, these aspects may be positive and refer to talent: the dream makes you aware of the artistic, musical, or creative skills that you do not use. The objects that are covered by this dust will give you a hint of the final oneiric meaning. (See ABANDONMENT and ASH)
According to gypsy tradition, the more dust in the dream, the less the annoyance you have to face.
Islamic Dream Interpretation
by Ibn SeerinA cloud of dust which is produced from a brisk movement of a car or a horse in a dream means controlling one’s affairs, indulging in falsehood or enticing trouble. Dusting one’s store and throwing the dirt on the sidewalk in a dream means business losses.
If a merchant sees his merchandises covered with dust in a dream, it means depression and unsalability of his merchandise.
(Also see Specs of dust)