What must a school project do to comply with the environmental tobacco smoke control requirement?

To comply with the environmental tobacco smoke control requirement, a project must ensure that there are clear and visible signs at the property line adjacent to all entrances indicating a no-smoking policy. This measure is crucial to inform everyone entering the building about the smoke-free environment and to mitigate any potential exposure to environmental tobacco smoke.

By placing signage at the entrances, the project effectively communicates the commitment to maintaining a healthy indoor air quality for students, staff, and visitors. This approach not only promotes awareness but also reinforces the smoking policy, helping to protect vulnerable populations, particularly children, from the harmful effects of secondhand smoke.

While the other choices involve reasonable actions related to smoking policies, they may not ensure comprehensive compliance with the specific requirement outlined in LEED guidelines. The focus on visible signage at all entrances helps address compliance in a direct and effective manner.