Airborne particulates terminology — what are submicron particles called? Particles smaller than 1 micron that can remain suspended in air for very long periods and be transported by wind currents are known as:

Introduction / Context:
Air pollution control relies on correct classification of particulates because control devices target different size ranges. Understanding terms like fumes, mists, smoke, and aerosols helps in selecting proper filtration and electrostatic precipitation methods.

Given Data / Assumptions:

• Particle size in question is less than 1 micron.
• These particles can stay airborne for a long time due to low settling velocity.
• Transport by wind indicates minimal gravitational settling.

Concept / Approach:
“Aerosol” is a generic term for a suspension of fine solid particles or liquid droplets in a gas. Submicron particles exhibit very low terminal velocities, remain suspended, and travel with airflow. While “smoke” typically refers to combustion-generated fine solids, and “fumes” are often condensed metal oxides from high-temperature processes, “aerosols” encompasses both solids and liquids and captures the key behavior highlighted here: persistent suspension and long-range transport.

Step-by-Step Solution:
Map the description (submicron, long suspension) to terminology.Recognize “aerosols” as the broad, accurate term for such particles.Select “Aerosols” as the best answer.

Verification / Alternative check:
Environmental engineering references define aerosols by size-dependent atmospheric residence time and transport characteristics consistent with the prompt.

Why Other Options Are Wrong:

• Fumes: often specific to condensed vapors (e.g., metal fumes), not the most general term.
• Mists: generally liquid droplets; the question does not specify liquids.
• Smoke: subset related to combustion; “aerosols” is broader and more accurate here.

Common Pitfalls:

• Assuming “smoke” for all fine particles; smoke excludes many non-combustion aerosols.

Final Answer:
Aerosols