Nanomaterials describe, in principle, materials of which a single unit is sized (in at least one dimension) between 1 to 1000 nanometres (10−9 meter) but usually is 1 to 100 nm (the usual definition of nanoscale).
Poor air quality is a major health risk, causing lung diseases, cardiovascular diseases, and cancer. Air pollution also impacts the environment, affecting the quality of fresh water, soil, and ecosystems.