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For complete effectiveness, how many areas of a confined space must reach toxic levels?

  1. Some areas can be sufficient

  2. Only critical areas

  3. All areas must reach toxic levels

  4. None as long as exposure time is sufficient

The correct answer is: All areas must reach toxic levels

For complete effectiveness in fumigation within a confined space, all areas must reach toxic levels. This is crucial because fumigation relies on the uniform distribution of the fumigant to eradicate pests effectively. If only some areas or critical areas reach toxic levels, there may remain pockets where pests can survive, leading to potential reinfestation. Ensuring that every section of the area being treated reaches the required concentration ensures that all harmful organisms are eliminated, maintaining the integrity of the fumigation process. Inadequate distribution can lead to incomplete pest control, which is the opposite of the goal of fumigation. Therefore, achieving toxic levels throughout the entire space is essential for a successful outcome.