Particle drift is primarily influenced by which factors?

• A. Droplet Size
• B. Wind Speed
• C. Wind Direction
• D. Droplet Size, Wind Speed, and Wind Direction

Answer: (D)

Particle drift happens when spray droplets are carried by air away from where you want them to land. The size of the droplets, the speed of the wind, and the direction of the wind all shape how far and where those droplets travel. Smaller droplets are lighter and more easily swept along by even gentle breezes, so they tend to drift farther than larger droplets. Wind speed matters because stronger winds push droplets farther before they settle. Wind direction determines the path of the drift—the spray travels downwind, so understanding which way the air is moving tells you where the droplets will likely go. Taken together, these three factors give the most complete picture of drift potential, which is why the best choice includes all of them.