Dust can seem to appear from nowhere. Some shelves and furniture can collect it faster than others. But science shows that surface type, air moisture and airborne particles can all affect how much dust builds up.
Materials engineer Nisa Salim, an associate professor at Swinburne University of Technology, says some surfaces are more likely to hold dust. The position of an object and the amount of dust in the air also matter.
Large dust particles often settle because of gravity. Smaller particles can stick to surfaces through weak molecular forces called Van der Waals forces. Rough and porous surfaces have more points where dust can settle.
A surface may look smooth but still have tiny marks and gaps. These small areas can trap fine dust.
Static electricity can also make some surfaces act like dust magnets. When materials rub together, electrons can move between them. This can leave a surface with an electrical charge.
Some dust particles can also carry a charge. They may then be pulled towards charged surfaces.
Materials such as acrylic, PVC, polyester and polypropylene do not conduct electricity well. They can hold an electrical charge for longer. Metal conducts electricity better, so its charge can fade faster.
Humidity also affects static charge. Water in the air can help electrical charges disappear from surfaces. Dry air can allow static charges to remain for longer.
This may explain why some homes seem dustier during cold and dry weather. Air conditioning can also create dry conditions that may help fine dust stick to furniture.
To test these ideas, a four-week home experiment tracked dust on a coat rack. The test looked at three possible ways to reduce dust.
During the first week, an air purifier and dehumidifier were turned off. The coat rack was left under normal conditions. This created a starting point for the later tests.
During the second week, an anti-static spray was used on one side of the coat rack. The other side was left untreated. The spray was meant to reduce static charge and limit dust.
The difference was very small. People could see slightly less dust on the treated side when they looked closely. However, the change was too small to make the spray a strong dust solution.
The third week focused on humidity. A dehumidifier was turned on after being off during the earlier test. The coat rack became noticeably dustier under the drier conditions.
This suggests that very dry air may increase the way dust sticks to some surfaces. It also shows that a dehumidifier may not always help if the main goal is to reduce visible dust.
The fourth week tested an air purifier. The purifier was placed about one metre from the coat rack. The dehumidifier remained off.
The result was clearer. After one week, the coat rack had noticeably less dust than during the previous tests.
The reason is simple. An air purifier removes particles from indoor air. A purifier with a HEPA filter can capture many small airborne particles. With fewer particles in the air, fewer can settle on furniture.
Home design can also affect how much dust becomes visible. Interior designer Richard Misso says homes can be planned with fewer places where dust can gather.
He recommends limiting open shelves, dark floors, glass surfaces, heavy decoration and complex joinery. These features can create more areas that need regular cleaning.
Matte surfaces can also be easier to maintain. Glossy surfaces may collect slightly less dust, but dust can be more visible on them. Matte finishes can hide small amounts of dust better.
A simple home with timber, brick and stone can also reduce the number of items that need frequent cleaning. The main idea is to create fewer places for dust to settle.
The experiment suggests there is no single fix for a dusty home. However, an air purifier may help by reducing airborne particles. Avoiding overly dry indoor air may also reduce static cling.
Furniture choices matter too. Fewer open surfaces and less clutter mean fewer places for dust to collect. A cleaner home may therefore start with cleaner air and a simpler space.
