An air purifying system, comprising: a base air purifier having a top and a bottom with a fan and a filter provided between the top and the bottom, the top having a seating surface; and a first portable air purifier (2, 3) having a first fan, a first filter, and a first base configured to be seated on the seating surface of the base air purifier, wherein the first portable air purifier (2, 3) is longer in a first direction than in a second direction, and wherein the base air purifier is longer in the second direction than in the first direction, and wherein the first direction is orthogonal to the second direction, wherein the base air purifier includes a first wireless charging module provided under the seating surface and the first portable air purifier (2, 3) includes a second wireless charging module provided in the first base such that, when the first portable air purifier (2, 3) is seated on the seating surface, the first and second wireless charging modules (121, 38) are aligned and the first portable air purifier (2, 3) provided with the second wireless charging module can be charged from the base air purifier including the first wireless charging module, characterized in that the system further comprising a second portable air purifier (2, 3), the second portable air purifier having a second fan, a second filter, and a second base configured to be seated on the seating surface of the base air purifier, wherein the seating surface of the base air purifier has a first surface and a second surface adjacent to each other in the second direction, the first surface of the seating surface being configured to support the first portable air purifier (2, 3) and the second surface of the seating surface being configured to support the second portable air purifier (2, 3). a base air purifier having a top and a bottom with a fan and a filter provided between the top and the bottom, the top having a seating surface; and a first portable air purifier (2, 3) having a first fan, a first filter, and a first base configured to be seated on the seating surface of the base air purifier, wherein the first portable air purifier (2, 3) is longer in a first direction than in a second direction, and wherein the base air purifier is longer in the second direction than in the first direction, and wherein the first direction is orthogonal to the second direction, wherein the base air purifier includes a first wireless charging module provided under the seating surface and the first portable air purifier (2, 3) includes a second wireless charging module provided in the first base such that, when the first portable air purifier (2, 3) is seated on the seating surface, the first and second wireless charging modules (121, 38) are aligned and the first portable air purifier (2, 3) provided with the second wireless charging module can be charged from the base air purifier including the first wireless charging module, characterized in that the system further comprising a second portable air purifier (2, 3), the second portable air purifier having a second fan, a second filter, and a second base configured to be seated on the seating surface of the base air purifier, wherein the seating surface of the base air purifier has a first surface and a second surface adjacent to each other in the second direction, the first surface of the seating surface being configured to support the first portable air purifier (2, 3) and the second surface of the seating surface being configured to support the second portable air purifier (2, 3).