This after the CDC released research last month saying that layering a cloth face covering over a surgical mask increases protection.
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In new guidance released by the California Department of Public Health, officials say double masking is an effective way to improve fit and filtration.
According to the CDC recent studies show that double masking decreases a person's exposure by 95%.
MORE | Should you wear 2 masks? We asked a doctor
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Should you wear two masks? We asked a doctor
MORE | Research shows 2 masks are better than 1, but fit is most important factor
2 masks are better than 1 but fit is most important factor, UNC researchers say