In an RTI to ICMR-National Institute of Virology (NIV), Pune, it was queried as follows:
“What is the pore size of the standard as well as surgical masks?”

Please find the RTI response below:
“Pore size of standard surgical mask and N95 mask is 0.3 – 10 μm & 0.1 – 0.3 μm respectively”

Please find the Full RTI details in PDF below: