The co2 concertration increased quickly when the peak period of tourism with the massive tourist flow, which is good for Karst action , but the dark and higher moisture and lower temperature are harmful to workers health in the cavern.

• 旅游旺季和黄金周客流量急剧增长带来的洞内空气co2浓度大幅度增长,有利于岩溶作用,但洞内黑暗、高湿、低温的生态环境,对洞内工作人员身体健康有害。