A total of 931 Pressure Swing Adsorption PSA plants have been installed at 869 sites during COVID-19 pandemic by Defence Research and Development Organization (DRDO) under Prime Minister Cares Fund. This was stated by Minister of State for Defence Ajay Bhatt in a written reply in the Rajya Sabha today.<span style="color: #222222;"> <br />''<br />''The Minister said maximum number of 103 PSA plants have been set up in the Uttar Pradesh followed by 62 in Tamil Nadu and 56 in Madhya Pradesh.  </span><br />''<br />