Can Nasal Filters Block PM 2.5?

As Bangkok residents continue to face high levels of dangerous fine particulate matter, or PM 2.5, many question whether nasal filters will help safeguard them from inhaling these tiny air pollutants.

Associate Professor Chanchai Sittipunt, Associate Dean for Planning and Development and professor at the Faculty of Medicine, explains that nasal filters help protect users from irritating allergens that are inhaled through the nose.  However, they are not intended to prevent the breathing in of particles through the mouth.  Additionally, there has been no research to confirm that nasal filters can protect users from air pollution.  Thus, this device cannot replace the use of N95 masks to filter PM 2.5.

Associate Professor Chanchai Sittipunt adds that if a person is in contact with high levels of dangerous fine particles or is exposed to it for a prolonged period of time, the person may develop certain health risks, including heart disease, dementia, and cancer.  It is recommended to avoid outdoor activities and wear protective masks before stepping outdoors. This is especially important for people with high risks, including patients with emphysema, asthma, and young children.

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Prof. Dr. Pornanong Aramwit Faculty of Pharmaceutical Sciences, Chulalongkorn University