Why should spray operations be avoided during temperature inversions or under conditions that favor drift?

• A. It makes spraying faster
• B. Inversions trap aerosols near ground and promote off-target movement; drift can cause damage and regulatory issues
• C. It doesn't matter
• D. It improves deposition

Answer: (B)

When a temperature inversion is present, a cool, stable layer sits near the ground and air above it is warmer. This stability greatly reduces vertical air mixing, so spray droplets stay riding in that near-ground layer instead of dispersing upward. With only light winds to move them, those droplets can travel horizontally and away from the target, causing drift. Drift can damage nearby crops, ornamentals, water sources, or sensitive habitats and can trigger regulatory or liability issues because it violates label directions and environmental protections. So, avoiding spray operations under inversion or drift-prone conditions minimizes off-target injury and regulatory risk, and you’re more likely to get the spray onto the intended area.