Which of the following is a plausible regulatory focus when addressing ozone-depleting substances?

• A. Reducing local air pollutants like dust
• B. Increasing carbon sequestration
• C. Eliminating all chemical use immediately
• D. Reducing substances that damage the ozone layer

Answer: (D)

The main idea here is targeting actions that directly prevent ozone layer damage. A regulatory focus that aims to reduce substances known to harm the ozone layer is the most direct and effective way to address the problem, since specific halogenated compounds (like certain CFCs and halons) drive ozone depletion. By reducing or eliminating these ozone-depleting substances, policies create measurable, enforceable progress and steer industry toward safer alternatives, which is exactly how regulations in this area are designed to work (for example, through bans, phased reductions, and substitution requirements).

Reducing local dust pollution, while important for air quality and health, does not address ozone depletion. Increasing carbon sequestration targets climate change, not the chemical processes that destroy the ozone layer. An immediate, total ban on all chemical use is neither practical nor focused on the specific substances that harm the ozone. Therefore, reducing substances that damage the ozone layer best captures the regulatory objective in this context.