Abstract: A device for detecting the presence of pollen in the air, including a measuring chamber isolated from external light, an arrangement configured to drive an air flow through the measuring chamber, and a light source emitting a light beam in a direction of propagation through the air flow, into the measuring chamber. The device includes at least four photosensitive sensors configured to measure the luminous flux diffused by the illuminated air flow, in four different directions, a clock, at least two meteorological sensors, and at least one computer capable of determining the nature of a pollen particle present in the air from the data measured by the photosensitive sensors, the clock and the meteorological sensors.

Abstract: A system (1) for analyzing solid particles in a medium (2), includes illumination elements (3) capable of generating a light field (30) in the medium (2), elements (4) for trapping at least a portion (30?) of the light field (30) generated and arranged in the direction (31) of the light field, and main detection element (5) for detecting the light field (30?) diffused by the solid particles within the medium (2). The main detection element includes a photodetector (52) for the light field (30?) diffused by the solid particles in the medium and a counter (53) for counting these solid particles in this medium, this main detection element being positioned in a direction (51) forming an angle (?) substantially ranging between 10° and 20° with respect to the direction of the light field generated. A method for analyzing solid particles in a medium implementing such an analysis system is described.