Soil treatment with most termiticides should not occur in which location?

Soil treatment with termiticides should not occur in crawl spaces used as a plenum because this type of space is integral to the building's heating and cooling system. In a plenum, air is circulated to distribute temperatures throughout the building. Introducing termiticides in this area can lead to the chemicals being aerosolized and dispersed into the living spaces of the home, posing health risks to the occupants.

Additionally, crawl spaces that serve as plenums can have limited control over air flow and may not provide adequate barriers for the pesticides, increasing the likelihood of unintended exposure. It's crucial to prioritize safety in such environments, ensuring that any pest control methods used do not compromise the air quality or health of the home's inhabitants.

In contrast, basements, attics, and outdoor gardens do not have this same risk associated with air circulation and contamination, allowing for safer application of termiticides in those areas.