Definition
Tiny solid particles suspended in the air or in a fluid, such as dust, soot, ash, pollen, smoke, or industrial pollutants. In aviation, particulates are a concern because they can be ingested by engines, contaminate fuel and oil, reduce visibility, and damage filters, sensors, and turbine components.
Plain English
Very small bits of solid material floating in the air or mixed into a liquid — like dust, ash, or smoke particles.
Context Anchor
Seen in weather and visibility discussions, and in maintenance references to fuel, oil, filters, or air systems.
Derivation
From the Latin particula, meaning 'a small part.' The word literally points to small fragments — which matches its aviation use for the tiny solid bits that affect engines, fuel, and visibility.
Why Pilots Care
Particulates can cause engine wear, clog filters, reduce power, or in sufficient quantity lead to engine failure or restricted visibility.
Grounding Statement
If smoke, dust, or haze makes the air look dirty or less clear, particulates are part of what you are seeing.
Intuition Check
Particulates does not mean only visible dust. It can mean any tiny solid pieces or liquid droplets carried in air, fuel, oil, or another fluid.
Example Sentence 1
The pilot diverted around the smoke plume to avoid drawing particulates into the engine intake.
Example Sentence 2
The crew diverted around the volcanic plume because the fine particulates could damage the turbine blades.