Fans to UV rays: All measures in place for safe Metro ride

AC filters, cooling coils, air diffusers and grills will also be thoroughly cleaned with sodium hypochlorite solution every seven days, as against the earlier norm of fifteen days. “Underground stations are air conditioned and precautionary measures have been taken by maintaining the inside temperature at 24-30 degree centigrade and relative humidity at 40-70 per cent. Temperature inside the coaches is maintained at 25 degree C to 27 degree C as per guidelines from Ministry of Housing and Urban Affairs, and fresh air supply will be increased from 25 per cent to 100 per cent,” a statement from CMRL said.

Indoor air quality is also maintained by including fresh air inside the station at around four times more than the recommended rate, and fans are run continuously at maximum capacity as per CPWD norm.

“Air circulation paths are provided with UV ray emitters which emits ultra violet rays that kills micro organisms present in the circulating air,” it said, adding that air handling units and fresh air fans would be operational two hours before starting the service and stopped two hours after to ensure no contamination remained inside. “Metro Rail tunnels are also ventilated by ventilation fans to get rid of the micro-organism present,” the statement added.