截至5月底，全国累计完成80%以上粗钢产能的超低排放改造

Core Insights - The overall trend of ozone pollution in China has been initially controlled, stabilizing over the past three years [1] Group 1: Current Situation of Ozone Pollution - From January to May this year, the national ozone concentration was 140 micrograms per cubic meter, a year-on-year increase of 0.7% [1] - There were a total of 2,480 days with ozone exceeding standards, higher than the historical average for the same period [1] - Ozone pollution characteristics this year include: 1. Early onset of pollution, with 80 cities exceeding ozone standards as early as March 26, one month earlier than the average start time [1] 2. Widespread pollution, with over 100 cities exceeding ozone standards for five consecutive days from May 26 to 30 [1] 3. Severity of pollution is greater in the south compared to the north, attributed to higher temperatures and lower precipitation in southern regions [1] Group 2: Future Measures for Ozone Pollution Control - The Ministry of Ecology and Environment will enhance ozone pollution prevention through four main strategies: 1. Improve air quality monitoring networks and closely monitor the concentration changes of ozone and its precursors, volatile organic compounds, and nitrogen oxides [2] 2. Continue to investigate and rectify issues related to volatile organic compounds, with 5,912 enterprises inspected from January to April, uncovering 10,388 issues, and 9,530 issues rectified [2] 3. Promote ultra-low emission transformations in key industries, with over 80% of crude steel capacity undergoing such transformations by the end of May, along with significant projects in coking and cement industries [2] 4. Strengthen environmental regulation of motor vehicles, focusing on heavy-duty trucks and inspection agencies to combat excessive emissions and fraudulent practices [2]