What do PPB and PPM measure in pesticide applications?

PPB and PPM are measurements that refer to concentrations of substances, specifically in this context, pesticides in applications. Parts per billion (PPB) and parts per million (PPM) help quantify how much of a substance is present in a specific volume of solution or mixture.

PPM indicates the number of parts of a substance in one million parts of total solution, while PPB represents the number of parts of a substance in one billion parts of total solution. This level of precision is crucial in pesticide applications, as it allows for the accurate determination of the concentration of active ingredients to ensure efficacy while minimizing potential harm to the environment and non-target organisms.

Understanding these measurements is critical for compliance with regulations and for practicing safe application methods. The other choices present incorrect definitions that would lead to confusion or misapplication of pesticide measures that are essential for maintaining safety and effectiveness in pest control practices.