To mitigate this risk in part, the Delhi Metro Rail Corporation (DMRC) has decided to increase the rate at which fresh air is pumped into train coaches and open ventilation vents at underground stations more often to ensure stale air escapes.
source https://www.hindustantimes.com/india-news/covid-19-as-metro-services-set-to-resume-air-flow-poses-biggest-health-challenge/story-WXpo3CUHCCvdpDRHCGnP2N.html
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