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Contrary to previous years, health expert asserts on N95 mask without valv
Updated : 5 years, 7 months ago IST
New Delhi [India], October 18 (ANI): The aggravated air condition following winter where particulate matter (PM) of 2.5 & 10 escalates to an alarming level forcing people to wear N95 mask with a valve to be on safe zone, this winter doctors are insisting on N95 mask without valve.
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