Question

which statement describes clean air as a natural resource? clean air can always be found indoors. clean air provides nitrogen gas for plant respiration. clean air reduces the risk of illnesses and other health problems.

Explanation:

Clean air is beneficial for health. Polluted air with high - levels of particulate matter can cause illnesses. Clean air reduces such risks. Clean air is not always found indoors. Plants use carbon dioxide for photosynthesis, not nitrogen for respiration in the way stated. And clean air is not "produced" by high levels of particulate matter.

Answer:

Clean air reduces the risk of illnesses and other health problems.