CDC says N95 masks offer the best protection against the ommicron variant, but doesn’t say everyone should wear them

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N95 masks, those approved by NIOSH, are designed to filter up to 95 percent of particulate matter, according to the CDC. KN95s are supposed to meet a similar Chinese standard, but according to Anne Miller, executive director of Project N95, a nonprofit that distributes free N95s and children’s masks in the United States, there is no Chinese regulatory body to ensure it. However, US companies make high-quality KN95s, she said.