The Roles of Invisible Dust, A Curiosity

What is dust? We see them as floating tiny specks reflecting sun light that managed to come through a hole in the roof of a hut or any other place. It is fun to watch how they float and even the gravity is sluggish to act upon it. This is at best the smallest speck of visible dust I have seen. But I do not know the individual components that make the dust.
Color, size, taste of the invisible dust beyond the reach of science in many locations. Any object is subjected to high heat turned to fine dust. It Is next to impossible to know what it was before. Any source of dust from a chemical, metallurgical, or artificial or image printing factories may be the source of acid rain. This is environmental, inhospitable pollution detriment to all life forms.
Accumulation of garbage in landfills generates invisible dust particles that carry harmful bacteria and viruses and spreads fast with the wind causing disease to all organisms living there.. Likes of Cholera, Ebola, Measles, Diphtheria, Spanish flu, and the Corona virus spreads by air to decimate world populations.
In combination with moisture, wind and heat this dust rise to the sky to form rain bearing clouds that carry electrical charges all over the world, causing thunder and lightning.This dust descends as rain with heat and moisture. Nitrogen, sulphur and other related compounds to support plant and animal kingdoms, to nurture the organisms in the earth and the oceans.
Regarding the size of the dust for example, Corona virus is reported to be in the range of 120 to 125 nanometers. For the laymen to have the grasp of its size is beyond his imagination. A nanometer is supposed to be 1 part of 1,00,000 bits of a meter.
Desire to see the virus, visit a viral research laboratory where we get the technician’s help of an Electron microscope to expand our capacity of vision thousand fold and finally see the Corona virus. Not only we wonder, but understand the challenges that face humanity to eradicate these disease causing agents.