What is a primary advantage of using ultra low volume (ULV) foggers compared to thermal foggers?

Using ultra low volume (ULV) foggers presents a primary advantage of lower fire and explosion hazard compared to thermal foggers. This is primarily because ULV foggers operate by dispersing pesticide formulations in very small droplet sizes without the need for heating or combustion processes, which can introduce additional risks. Thermal foggers, on the other hand, generate heat to vaporize the pesticide, making them more susceptible to igniting flammable materials present in the environment. Consequently, the reduced risk associated with ULV foggers makes them a safer choice in many scenarios, particularly in areas where fire hazards are a concern.

The other options present less favorable characteristics. Longer treatment time does not typically apply to ULV foggers, as they are designed for efficient application. Higher pesticide consumption is not an advantage because ULV should ideally allow for effective pest control with minimal chemical use. While visible fog during application can be a benefit, the clarity of visibility is not necessarily a primary advantage when assessing safety and operational efficiency.