<span style="color: #222222;">Civil Aviation Minister Hardeep Singh Puri today said that Air India has brought 318 oxygen concentrators to India on its New York-Delhi flight today.</span><br />'' <span style="color: #222222;"> </span><br />'' <span style="color: #222222;">He said, all efforts to strengthen India's fight against the pandemic are on. He said, let there be no doubt, we will turn the tide.</span><br />'' <span style="color: #222222;"> </span><br />'' <span style="color: #222222;">Ambient air contains about 20 per cent oxygen and 78 per cent nitrogen.</span><br />'' <span style="color: #222222;"> </span><br />'' <span style="color: #222222;">An oxygen concentrator is a device that takes in ambient air and filters out the nitrogen from it to concentrate the oxygen molecules in the treated mixture.</span><br />''  <br />