Which weather condition usually increases drift risk during spraying?

• A. Calm, clear days with no wind.
• B. High humidity with no wind.
• C. Windy or gusty conditions and high air movement.
• D. Light drizzle with no wind.

Answer: (C)

Drift happens when spray droplets are carried by moving air. The more air movement there is, especially if wind is windy or gusty, the more droplets can be blown off target, widening the drift risk. In calm, no-wind conditions, droplets tend to settle more directly where you aim, so drift is minimal. High humidity without wind doesn’t create horizontal movement, and light drizzle with no wind still means droplets mostly fall rather than move sideways. So the weather condition that usually increases drift risk during spraying is windy or gusty conditions with high air movement.