Which factor is most important for determining the effectiveness of a fumigation treatment?

The concentration of the fumigant is crucial for the effectiveness of a fumigation treatment because it directly impacts the ability of the fumigant to penetrate the targeted material or environment and effectively neutralize pests or pathogens. A higher concentration generally increases the likelihood of successful treatment, as it ensures that there are sufficient active particles in the air or within the material to kill or eliminate the target organisms.

While temperature, humidity, and duration of exposure do play significant roles in the overall effectiveness of a fumigation treatment, they predominantly serve as supplementary factors. Temperature can enhance or inhibit the activity of the fumigant and the target organisms, while humidity can affect how well the fumigant disperses. Duration of exposure ensures that the fumigant has enough time to act on pests, but without adequate concentration, even an extended exposure may not yield desired results. Therefore, proper concentration is essential to ensure that the fumigant can effectively perform its intended function, which is why it is deemed the most important factor among the options presented.