Air Quality Monitoring Device

An air quality monitoring device for measuring the concentrations of particulate matter and gaseous substances contained in external air (A), the air quality monitoring device comprising:

• a casing (110) having a vertical inlet duct (111) having an inlet (111a) formed at the bottom thereof to introduce the external air (A) thereinto, a diverting duct (113) connected to the vertical inlet duct (111) to change an airflow direction, and a vertical outlet duct (115) connected to the diverting duct (113) and having an outlet (115a) formed at the bottom thereof;
• a heating type humidity controller (120) placed in the inlet (111a) of the vertical inlet duct (111) and making measurement air (A1) by heating the external air (A) and lowering the relative humidity of the external air (A);
• an air quality monitoring sensor (130) disposed in a flowing path of the measurement air (A1) passing through the heating type humidity controller (120) to measure the concentrations of particulate matter and gaseous substances in the measurement air (A1);
• and
• an air circulating fan (140) disposed inside the casing (110) in such a way as to rotate and generate a negative pressure so that the external air (A) is introduced into the inlet (111a) and then discharged from the outlet (115a).