Ariuntuya TserendorjSainsanaa Amarsanaa2024-11-082024-11-082018-05-31https://gmitlibrary.net/handle/123456789/80Nalaikh is located in Ulaanbaatar, Mongolia, known for illegal mining activity. Earlier investigations concerned mining land disturbance and pointed on air, soil and importantly water. Which revealed in unexpected arsenic, which is a highly toxic element, exposure in the Bus Lake. The research is aimed to find seasonal and weather changes of the Bus Lake characteristics and indicating level of toxicity.enThesis