On November 13, 2018, Liu Xinwei, a reporter from Beijing Science and Technology News, published an article "Don't take off your mask, the air quality is worse in the subway! Where does the PM2.5 in the subway come from?", which reported on the seminar held by REEI on October 24, 2018. During the seminar, Zhao Ang, co-director of REEI, said that "tracing the source of PM2.5 in subways is a major obstable." This topic was discussed at the seminar, with hopes that it would be a reference for improving the air quality of subway. 

For more information, click the link to read the full article:进地铁别摘口罩，空气质量还不如室外！地铁里的PM2.5从哪来的？