As we mentioned before, air purifiers with HEPA filters can help reduce particle concentrations by up to 85%, according to the EPA
AdvertisementADVERTISEMENT This is complicated, according to Michael Chary, MD, PhD, an emergency medicine physician and fellow in medical toxicology at Harvard Medical Toxicology Program at Boston Children's Hospital
N95 masks provide the greatest risk reduction, but a good cloth mask with a center filtering layer does still reduce risk substantially. That said, according to Ronaghi, smoke particles are one-30th the size of a single strand of hair and can easily slip through the gaps of a fabric face mask
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