Atmospheric particulate matter detecting device and method

The invention discloses an atmospheric particulate matter detecting device comprising detecting space, an air inlet nozzle, an air outlet nozzle, a first detecting point, a second detecting point, anda first detecting unit for detecting the particulate matter concentration and diameter of the first detecting point, a second detecting unit for detecting particulate matter components of the seconddetecting point, and a photoelectric detection circuit connecting the first detecting unit and the second detecting unit. The first detecting unit detects the particulate matter concentration and diameter in gas at the first detecting point; and when the gas at the first detecting point moves to the second detecting point with the air flow, the second detecting unit detects the particulate mattercomponents in the gas again. 本发明公开种大气颗粒物检测装置，包括检测空间、进气嘴、出气嘴，第检测点、第二检测点、用于检测所述第检测点的颗粒物浓度与直径的第检测单元，用于检测所述第二检测点的颗粒物成份的第二检测单元，以及连接所述第检测单元与所述第二检测单元的光电检测电路，由于本发明通过第检测单元检测第检测点的气体内的颗粒物浓度、直径，当第检测点的气体随着气流移动至第二检测点时通过第二检测单元再次检测该些气体内的颗粒物成份。