环保设备板块2月4日涨1.44%，雪迪龙领涨，主力资金净流入1921.49万元

Group 1 - The environmental equipment sector increased by 1.44% on February 4, with Xuedilong leading the gains [1] - The Shanghai Composite Index closed at 4102.2, up 0.85%, while the Shenzhen Component Index closed at 14156.27, up 0.21% [1] - Key stocks in the environmental equipment sector showed significant price increases, with Xuedilong rising by 5.96% to a closing price of 10.14 [1] Group 2 - The environmental equipment sector experienced a net inflow of 19.21 million yuan from institutional investors, while retail investors saw a net outflow of 53.76 million yuan [2] - Major stocks like Xuedilong had a net inflow of 75.84 million yuan from institutional investors, but a significant outflow of 74.06 million yuan from retail investors [3] - The overall trading volume and turnover in the environmental equipment sector reflected active market participation, with notable transactions in stocks like Chuangyuan Technology and Guolin Technology [2][3]