The aim of this article is to present the control and monitoring system implemented to the bio-filter of the El Paraíso hydroelectric generation plant, which efficiently seeks to reduce the levels of emanation of hydrogen sulfide H2S, a colorless, flammable and toxic gas with a characteristic smell of "rotten eggs" produced by the use of the waters of the Bogotá river in the energy generation process.The plant has a biological filter made up of microorganisms used to remove contaminants, which require certain environmental conditions such as humidity and temperature for their development and survival.In order to address this problem, the document describes the requirements needed to implement the control and monitoring system, which make it possible to supervise and control all of the processes involved in the production and reduction of hydrogen sulfide H2S.These processes include supervision and action of the air extractors, internal and external watering of the bio-filter by controlling its humidity and temperature limits, and control of foam in the stilling tank.Likewise, the operation of the systems is related to the programming of generation schedules of the units, seeking to minimize the impact of environmental conditions in the Plant and its surroundings.The contribution presented through the implementation of the Control System showed as a result an improvement in the efficiency of the bio-filter, reducing the concentrations of gas found in the bio-filter by 70% and a reduction in the explosion limits by 85%, evidencing a great improvement in the surroundings of the plant, cleaning up the quality of the air.