Benchmark 6E
The Human Organism: Physical Health
Grades 6-8, page 145

The environment may contain dangerous levels of substances that are harmful to human beings. Therefore, the good health of individuals requires monitoring the soil, air, and water and taking steps to keep them safe.

 NSES Content Standard F 
Science in Personal and Social Perspectives: Personal health 
Grades 5-8, page 168 
Natural environments may contain substances (for example, radon and lead) that are harmful to human beings. Maintaining environmental health involves establishing or monitoring quality standards related to use of soil, water, and air.