Pesticides that degrade quickly in the environment are considered to be:

Pesticides that degrade quickly in the environment are indeed categorized as least hazardous. This classification is due to their reduced persistence, meaning they do not remain in the environment long enough to cause significant ecological or human health risks. Such pesticides break down rapidly into less toxic substances, which minimizes their potential for bioaccumulation in the ecosystem and reduces the likelihood of long-term exposure.

This quick degradation is beneficial as it limits the pesticide's lifespan in soil, water, and non-target organisms, contributing to an overall healthier environment. In contrast, pesticides that are persistent can accumulate and pose ongoing hazards, whereas fast-decomposing substances are generally considered safer for use in agricultural and residential settings.