中国中东部地区出现PM2.5污染过程，87城启动重污染天气预警

Group 1 - Since late January, the central and eastern regions of China have experienced a PM2.5 pollution event, with worsening pollution levels recently [1] - As of now, 87 cities in the Beijing-Tianjin-Hebei region, Yangtze River Delta, and Central Yangtze River regions have activated heavy pollution weather warning responses to address this cross-regional pollution event [2] - The main causes of this pollution event include unfavorable meteorological conditions and high levels of regional pollution emissions, with increased activity in the coal-fired heating sector and stable operations in industries like steel and glass production [1] Group 2 - As of January 25, cities such as Anyang, Hebi, and Xinxiang in Henan, and Xingtai in Hebei have issued red alerts, while cities in Tianjin have issued orange alerts, and some cities in Jiangsu, Zhejiang, Jiangxi, and Hunan have issued yellow alerts [2] - Following the activation of pollution alerts, significant reductions in emissions from key industrial sources have been observed [2] - The China Environmental Monitoring Station predicts that this pollution event will continue until late January, with improvements expected from January 29 due to incoming cold air and precipitation [2]