A nan (non-aquatic particle size) measurement contributes to water quality assessment by measuring the amount of suspended particles. It is an important indicator of water turbidity, which can be caused by natural elements or human activities such as soil erosion and wastewater runoff. Measuring nan is essential for monitoring the health of aquatic ecosystems and the potability of drinking water. High nan values ​​can indicate pollution or environmental disturbances that require special attention to preserve water quality.