As many 256 oxygen concentrators have arrived at the City's Chhatrapati Shivaji Maharaj International Airport (CSMIA) from Singapore amid an acute shortage of medical oxygen in the wake of huge spike in Covid-19 cases in the country, the private airport operator said on Wednesday.

The oxygen concentrators weighing approximately 5.5 tonnes, landed in two tranches with each consisting of 128 concentrators in the last two days, it said.