System for reducing atmospheric pollution generated in printing house, and operation method therefor

A system for reducing atmospheric pollution occurring in a printing facility including a plurality of printing devices, each of which has an air purifying module and an exhaust hole connected to the air purifying module, and which are located in a printing area, the system comprising:

• a particulate pollutant processor communicating with intake holes located at each exhaust hole, and connected to the intake holes through a first valve;
• a gaseous pollutant preprocessor connected to the particulate pollutant processor through a second valve;
• a high concentration processing filter unit and a low concentration processing filter unit connected to the gaseous pollutant preprocessor through a third valve;
• a fan connected to the high concentration processing filter unit and the low concentration processing filter unit, which converge;
• a first bypass passage connecting the second valve and the fan to bypass the gaseous pollutant preprocessor, the high concentration processing filter unit, and the low concentration processing filter unit;
• a second bypass passage connecting the first valve and the gaseous pollutant preprocessor to bypass the particulate pollutant processor;
• a first sensor located at each exhaust hole to measure particulate pollution concentration and gaseous pollution concentration, and control the first valve, the second valve, and the third valve;
• and
• a second sensor located outside the plurality of printing devices within the printing area to measure particulate pollution concentration and gaseous pollution concentration, and control the first valve, the second valve, and the third valve.