<span style="color: #222222;">Health and Family Welfare Minister, Dr. Harsh Vardhan said that National Chemical Laboratory, Pune has designed face masks that can filter out up to 99.9 per cent bacteria and 92.6 percent of the particulate. <br />''<br />''In a tweet today, he said, these masks are made up of hydrophobic polypropylene a medical grade cloth suitable for blocking droplets containing corona virus.</span><br />