On October 27, 2021, the public platform for self-monitoring information of key monitoring enterprises in Shaanxi Province showed that the total nitrogen of the wastewater discharge port of Yijun County XXX Wastewater Treatment Plant was suspected to exceed the standard on October 20, 2021 and October 21, 2021. PECC reflected the situation to the local environmental protection bureau via 12369 and Weibo, as detailed in the following chart:

December 7, 2021 received the Tongchuan City Ecological Environment Bureau Yijun Branch Emergency Response Center: for the exceeding of the standard has been issued a notice ordering rectification of violations, and a case has been filed for investigation.