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Just like many other aspects of face mask design including size, fit, and color, there is more than one option when it comes to face mask filters. Similar to the filter in your air conditioner, a face mask’s filter does the essential job of trapping airborne contaminants and “particulate matter” (PM) before they can spread and potentially cause harm. Because of this, the filter is one of the most important aspects in determining a face mask’s effectiveness, and you should be as informed as possible when it comes to choosing the best one.