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"Air filtered, moistened, and warmed" refers to air that has been cleaned of particles, humidified, and heated to body temperature as it passes through the nasal passages.
Explanation:
When air is inhaled, it is filtered by nasal hairs and mucus, moistened by mucous membranes, and warmed by blood vessels in the nasal passages. This prepares the air for the lungs, making it clean, humid, and at a comfortable temperature.