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Which substances require special licensing to handle due to their gas-producing properties?

  1. Herbicides

  2. Fumigants

  3. Insecticides

  4. Biopesticides

The correct answer is: Fumigants

Fumigants require special licensing to handle because they are designed to release gases or vapors that can penetrate materials and environments, killing pests. Their gas-producing properties also pose significant risks to human health and the environment if not handled properly. Due to these hazards, a higher level of training and regulation is necessary to ensure safe usage, application methods, and adherence to safety guidelines during transportation and storage. This licensing process is critical for ensuring that only qualified individuals manage these potent substances, minimizing potential dangers associated with their volatilization and exposure. Herbicides, insecticides, and biopesticides typically do not have the same gas-producing attributes as fumigants, thus requiring different levels of training and regulatory compliance that are generally less stringent than those needed for handling fumigants.