Which of these is a potential hazard associated with the use of fumigants?

Fire and explosion risks are indeed a potential hazard associated with the use of fumigants. Many fumigants are volatile compounds that can form flammable mixtures in certain concentrations when combined with air. Additionally, some fumigants can decompose into more flammable substances when exposed to heat. Proper handling, storage, and application practices are crucial to mitigate these risks and ensure the safety of both the applicator and the environment.

The other options, while relevant environmental concerns, do not directly relate to the specific hazards posed by fumigants. Soil erosion and loss of nutrients in soil are typically associated with agricultural practices rather than fumigation itself. Water contamination is more commonly a concern for pesticides or fertilizers that can leach into waterways, rather than a direct effect of the fumigants used in sealed environments, like storage facilities or soil treatments.