Each Kerala district is gearing up with "oxygen buffer zones" to combat a surge in Oxygen demand amid a rise in Covid cases. In capital Thiruvananthapuram, Tehsildars - revenue officials - over the last 4 days have attached over 300 industrial oxygen cylinders. They are being converted into medical oxygen cylinders for emergency use. The oxygen war rooms, being set up in each district, will play a crucial role in "oxygen-audit" and ensuring priority distribution.