Abstract: A heat dissipating fan includes a stator and a rotor. The stator includes a bearing and a winding structure, wherein the bearing is disposed in the winding structure. The rotor includes a fan wheel, a ring-shaped casing and a magnetic member, wherein the ring-shaped casing is disposed in the fan wheel and the magnetic member is disposed in the ring-shaped casing. The fan wheel has an axle inserted into the bearing such that the winding structure is located within the magnetic member. At least one protruding portion protrudes from one side of the ring-shaped casing inwardly and is extended below the winding structure so as to hold the magnetic member and interfere with the winding structure.

Abstract: A fan structure includes a hub and at least one set of blades connected to and extending away from the hub, each of the blades having a plurality of steps with a height difference formed away from the periphery of the hub, the height of the inside one of the steps higher than that of the outside one of the steps, thereby providing a disturbed flow-guiding effect so as to enhance the air pressure and the air flow of the wind flow field.

Abstract: Provided are a system and method for detecting air pollution, characterized by using an air pollution detecting device for detecting air pollutants, using a positioning device for locating the air pollution detecting device, and enabling a data transmission device to transmit air pollution data and position data to a data analysis and management device via a network system, and then enabling the data analysis and management device to perform analysis and management process on the data; accordingly, perceiving air pollution status at each area and thus proving air pollution information and improvement to air pollution areas in a shorter time.