What can signify successful fumigation?

Successful fumigation is best signified by a decrease in the pest population, which can be verified through inspection after the treatment. The primary goal of fumigation is to eliminate pests—whether they are insects, rodents, or other organisms—within a designated area. After fumigation, an inspection should confirm that the target pests have been effectively eradicated, indicating that the fumigation process worked as intended.

Other options may suggest changes in the environment but do not directly confirm the effectiveness of the fumigation process itself. For instance, a reduction in humidity levels may help create conditions less favorable for pests but does not inherently indicate that they have been eliminated. Improvement in air quality can occur due to various factors, including ventilation, rather than being a direct result of successful pest eradication. Similarly, a lower concentration of fumigants detected in the air might indicate dispersal of the fumigants but does not provide evidence that the pests within the treated area have been effectively managed. Thus, the decrease in pest population confirmed by inspection is the most definitive sign of successful fumigation.