The device for reducing air pollution using microalgae according to the present invention includes an outer case having an air inlet formed on one side and an air outlet formed on the other side, and installed in the outer case so that external air flows through the air inlet inside the outer case a blowing unit generating a blowing force so that it can be discharged through the air outlet after being sucked into the air outlet; A guide unit for guiding to the air outlet, a culture unit for culturing microalgae that generates oxygen by consuming carbon dioxide in the air sucked into the outer case, and the guide from the upper side of the guide unit by pumping the culture solution of the culture unit and a spray unit that sprays towards an air flow within the unit. As described above, using the device for reducing air pollution using microalgae according to the present invention has the advantage of efficiently removing carbon dioxide and dust in the air and increasing the oxygen concentration in the air.
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