Which is NOT a primary factor influencing plume dispersion?

Which is NOT a primary factor influencing plume dispersion?

• A. Humidity influences aerosol behavior.
• B. Wind direction and speed drive plume path.
• C. Sunlight exposure directly neutralizes chemicals.
• D. Temperature inversions affect vertical spread.

Answer: (C)

Plume dispersion is driven mainly by how air moves and mixes. Wind direction and speed push and steer the plume, determining its path and how quickly it dilutes. Humidity influences aerosol behavior by changing particle size and evaporation, which can alter how the plume travels and remains suspended. Temperature inversions create a stable atmospheric layer that limits vertical mixing, keeping the plume more confined near the ground or altering its vertical reach. Sunlight exposure, while it can cause some chemical reactions for certain substances, does not reliably neutralize chemicals in the short term and does not consistently affect how the plume spreads. That’s why the sunlight-related option is not a primary factor influencing plume dispersion.

Plume dispersion is driven mainly by how air moves and mixes. Wind direction and speed push and steer the plume, determining its path and how quickly it dilutes. Humidity influences aerosol behavior by changing particle size and evaporation, which can alter how the plume travels and remains suspended. Temperature inversions create a stable atmospheric layer that limits vertical mixing, keeping the plume more confined near the ground or altering its vertical reach. Sunlight exposure, while it can cause some chemical reactions for certain substances, does not reliably neutralize chemicals in the short term and does not consistently affect how the plume spreads. That’s why the sunlight-related option is not a primary factor influencing plume dispersion.