Yesterday, Mr. Chen from Fuzhou called 95060 and said: Qinting Lake was polluted again, and half of the lake was dyed yellow. Yesterday afternoon, the reporter found at the scene that black dirt such as Moss remained on the side of the lake, but no pollution source was found at the scene. At 5 pm yesterday, the reporter rushed to Qinting Lake. Looking up, half of the lake has been dyed yellow, and the yellow begins to spread from the southeast side of Qinting Lake. Mr. Chen, a nearby resident, said that at about 12 noon, he found the lake turned yellow. There are many construction sites on both sides of Qinting Lake, and Mr. Chen suspected that it was caused by construction site mud. Then the reporter came to the southeast side of Qinting Lake and found that the lake water here was indeed more yellow than other places, but the reporter did not find that the construction site was discharging sewage. Why does Qinting Lake turn yellow? Where does the source of pollution come from? Haidu reporter will continue to track. (Reporter Chen Xiaomao Chaoqing)