Which of the following best defines pesticide waste?

The definition of pesticide waste accurately encompasses old pesticides that may no longer be effective or needed. As pesticides age, their efficacy can diminish due to chemical breakdown or due to changes in regulations that render them obsolete. This means they cannot be used for their intended purposes safely or legally.

Pesticide waste is important to recognize and manage properly, as improper disposal can lead to environmental contamination or pose risks to human health. In contrast, newly purchased pesticides waiting for application or those that can still be used do not qualify as waste, as they are still viable and compliant with applicable regulations. Likewise, recently stored pesticides that are intact and well-preserved also do not fit the definition of waste, as they remain effective for their intended use.