There's no set formula for 'dust'. It depends on what kind of dust it is.
Sometimes They are in a a homogeneous mixture such as salt water or brass but are not in a heterogeneous mixture such as mud or oily water.
Steel Iron carbide or just plain carbide.
The type of mixture bleach is (NaOCI) Is a homogeneous mixture.
If the mixture is completely homogeneous, then the mixture is true solution as in thesolution the solute particles are completely dissolved and have uniform composition.These are transparent.A colloid is a type of mixture in which one substance is dispersed evenly throughout another. These are mostly translucent, for example:-milk.A suspension is most easy to identify since the solute particles do not dissolve in the solution. They either keep floating in the solution or settle down at the bottom.
Perfume is considered a type of mixture. It is a homogeneous mixture since it is made of different chemicals that are mixed into one consistent form.
Salt particles in the air are not an example of particulate matter. Particulate matter refers to a mixture of solid particles and liquid droplets in the air that can include substances like dust, pollen, soot, and smoke. Salt particles are considered a different type of substance.
A sandstorm is a mixture of sand particles, dust and wind. Heavier sand particles are found closer to the ground and lighter dust particles higher up. A violent sandstorm can be tens of kilometers wide, several hundred meters tall and can last for several days.
Mixing water and dust can create a muddy or sludgy mixture. The dust particles can become suspended in the water, creating a cloudy appearance. Depending on the type of dust, this mixture may settle over time, leaving sediment at the bottom.
HOMOGENEOUS
A plastic bead mixture.
This is a colloidal mixture.
Smog would be classified as a homogeneous mixture because you cannot distinguish particles from eachother. It looks like one substance hovering over cities. Being able to see different substances obviously would make it a heterogeneous mixture. not to try and confuse you, but if you had better means to analyse the smog, you might be able to see it as a colloid or suspension, where you can see particles suspended in another.
A mixture in which small particles of a substance are dispersed throughout a gas or liquid. If a suspension is left undisturbed, the particles are likely to settle to the bottom. The particles in a suspension are larger than those in either a colloid or a solution. Muddy water is an example of a suspension e.g. the residue at the bottom of the container
Smoke. The general term for a suspension of either liquid or solid particles in a gas is "aerosol."
Dust is mainly discarded human skin scales and other debris. Dust mites are very tiny spider type scavengers that recycle dust particles into editable food. They recycle so well that they can actually continue to eat what other dust mites have expelled.
This is a mixture solid-liquid or solid-gas.
Sometimes They are in a a homogeneous mixture such as salt water or brass but are not in a heterogeneous mixture such as mud or oily water.