Why does pyrethrin kill mosquitoes and yet doesn’t present a significant risk to people when applied aerially?
Very small amounts of pyrethrin are used during aerial spraying (0.007 pounds per acre). There is virtually no risk of adverse health effects in humans. Like any chemical the health effects that could potentially occur in an individual depend on the amount that enters the body. While the amount of airborne pyrethrin after mosquito spraying is in sufficient to cause any significant health effects in humans, it is sufficiently potent to kill something tiny as mosquitoes and other insects.
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