Currently, public health is critical issue throughout the world. Especially people are concerning about indoor air quality like home and subway system. Old lines of subway systems are constructed more than 30 years ago in Seoul. At that time there was less concerning about public health. Nowadays, people are put many effort to make better air quality in subway system. In order to control subway air quality intelligently, we need integrated monitoring and controlling system. In this way we can better air quality and save energies. In this paper, we propose an integrated monitoring and controlling system for subway system.