This new product launch will effectively block PM2.5-sized ultrafine dust, which is only 1/20th the thickness of the hair, by applying a double filter network structure. The product is designed such that it will widely remove various harmful substances like yellow dust, pollen, and mold spores, and is 100% produced in Korea. https://www.coherentmarketinsights.com/news/bulls-one-announced-the-launch-of-a-new-pm25-ultra-fine-dust-high-efficiency-filter-1433