What is an example of a practical application of PECQs in environmental policy?

The correct answer illustrates how PECQs can be employed as a tool for establishing guidelines and regulations aimed at minimizing environmental risks associated with chemical substances. When analyzing and assessing the potential ecological impact of various chemicals, PECQs help quantify potential risks by comparing the concentration of these chemicals in the environment to levels known to cause harmful effects.

In the context of the correct option, restrictions on chemical use in agriculture can be formulated based on PECQ data by identifying which chemicals pose the greatest risks to soil, water, and biodiversity. By setting legal limitations on the use of certain chemicals that exhibit high PECQs, policymakers can proactively safeguard natural ecosystems and human health from harmful effects. This approach is rooted in the understanding that chemicals with elevated PECQs are more likely to cause ecological degradation.

In contrast, the other options do not reflect the intended purpose of PECQs. Promoting more pesticide usage runs counter to the objective of using PECQs to mitigate risks. Ignoring pollutant levels directly undermines the purpose of measuring environmental impact. Lastly, while enhancing chemical manufacturing processes may improve efficiency, it does not address the ecological assessments that PECQs are designed to support. The focus of PECQs is on understanding and managing the environmental implications of chemical usage, which aligns with the need