Regulations will not allow a pesticide that is toxic to humans to be used inside houses unless the pesticide will dissipate completely from the air within eight hours after its application. One test that pesticide manufacturers standardly use to determine how quickly anti-termite pesticides dissipate involves spraying the pesticides on the walls of room-sized plywood boxes and then timing its dissipation.

Which of the following would it be most useful to know in order to evaluate whether a dissipation time of just under eight hours on the manufacturers' test indicates that an anti-termite pesticide that is toxic to humans obeys regulations for use in houses?

【选项】Whether anti-termite pesticides that are not toxic to humans tend to take longer to dissipate than those that are toxic