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 is produced when high levels of ultrafine particles circulate. clean air reduces the risk of illnesses and other health problems.

Explanation:

Indoor air isn't always clean. Plants use carbon - dioxide in photosynthesis, not nitrogen for respiration. High levels of ultrafine particles indicate polluted air. Clean air is beneficial for health as it reduces the risk of illnesses.

Answer:

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