Dust is actually composed of items like human skin cells, fabric fibers, pet dander, dust mite excrement, as well as dirt and debris being tracked inside.
Dusting is a necessary chore for a few reasons. Dust on surfaces can make surfaces look dingy and dirty. Dust can actually cause scratching and damage to household surfaces. Dust also presents allergy and breathing problems for many groups of people. Dusting as a regular chore can protect family members and the surfaces of our homes.
If no one in your household suffers from allergies, you won't have to worry about the health effects of dust as often as other families do. You'll still need to dust electronics and furniture weekly to prevent buildup that can scratch, damage, and clog surfaces in your home. More out of the way spots like ceilings, corners, and door frames will only need to be dusted as needed, and may only require your attention every couple of months.
If you do have an allergy sufferer in your home, you may need to dust spots that attract dust like electronics and furniture bi-weekly or weekly. Out of the way spots won't be able to be forgotten either. Dust door frames, ceilings, baseboards, and more every 1-2 weeks to prevent a buildup that can trigger an allergic reaction. Be sure to use a dusting tool that won't just spread the dust back into the air.