What classification is NOT used to categorize pesticides?

The classification system for pesticides typically includes several key categories to help users understand how to handle and apply them safely and effectively. Toxicity refers to how hazardous a pesticide is to humans and animals, with classifications ranging from highly toxic to relatively safe. Environmental effects assess the impact a pesticide may have on non-target species and ecosystems, which is crucial for minimizing ecological damage. Use pattern typically describes how and where a pesticide may be applied, such as indoor, outdoor, agricultural, or residential uses.

Usage intent, while it may reflect the purpose of applying the pesticide (such as insect control, weed control, or fungicide), is not a standardized classification used within regulatory frameworks or safety guidelines. This distinction makes it the correct answer, as it doesn't fit within the established categories that are consistently used across the pesticide industry.