The paper acknowledges but does not model the decay of photocatalytic performance over time. Including a degradation curve would improve realism and the robustness of the break-even analysis. Consider adding visual representations (e.g., sensitivity analysis graphs, degradation timelines, uncertainty bars) to better convey results and limitations, especially in the results section. The manuscript would benefit from a short discussion on the real-world feasibility, costs, and maintenance of TiO₂-coated pavements based on existing pilot projects or implementation case studies.