In a low air pressure. Hot body gives a small particles such as dust. Carbon from the ground up, smoke hung in the air, floating mass is called a "clean air" (Aerosols)
The low pressure Hot air rises, making the amount of small particles such as dust and soot from the ground up, suspended in the air. This is referred to as "dust" (Aerosols).
In the area of low pressure. Hot air, lift up the quantity of small particles such as dust, soot from the ground up to suspended in air, which is called the. "The dust of the air" (Aerosols).