Study on improving effects of negative ion technique on environment in an underground railway station

Monitors the change of the contamination concentration and the amount of passengers in peak hours before and after using the technique in Xujiahui underground railway station in three typical air conditioning seasons. Explores the effects of environment improvement in platform and station hall of the station. Emphatically analyses the characteristics of this technique, evaluates its cleaning effect in response to passenger flow and air distribution, and discusses the practicability of applying negative ion technique to such locations.