What is the primary risk associated with pesticide spray during a temperature inversion?

The primary risk associated with pesticide spray during a temperature inversion is the potential for lateral movement of spray. During a temperature inversion, warmer air traps cooler air near the surface, creating a stable atmospheric condition that can lead to reduced air movement. This stability can prevent the dispersion of pesticide particles, causing them to hang in the air longer than they normally would.

As a result, the pesticides can drift horizontally across a greater distance from the target application area. This lateral movement increases the likelihood of off-target effects, potentially impacting non-target organisms, beneficial insects, nearby crops, and even residential areas. Understanding and recognizing the conditions of a temperature inversion is crucial for applicators to minimize environmental and health risks associated with pesticide use.