Which factor can increase the risk of pesticide drift?

Fine spray droplets significantly increase the risk of pesticide drift because their small size allows them to remain airborne for longer periods and be carried farther by the wind. When pesticides are applied as fine droplets, they can easily be picked up by even low wind currents, leading to unintentional deposition on non-target areas, which can be harmful to surrounding ecosystems, human health, and beneficial organisms.

In contrast, low wind speeds typically reduce the likelihood of drift, high humidity can cause droplets to coalesce rather than drift, and heavy rain can wash pesticides off target areas, also minimizing drift. Therefore, using coarse droplets or larger spray techniques can help mitigate drift risk.