In a bid to utilise manpower efficiently, the Brihanmumbai Municipal Corporation (BMC) has divided Containment Zones (CZs) into two parts — manageable buildings and congested areas. But, even after the division, there are 1,200 buildings where people aren't free to move around for the next 14 days. The number of CZs in congested areas has almost become half of what it was, as the BMC has sealed whole slum pockets containing multiple CZs.

As per the standard operating procedure, the civic body seals a building or an area if someone tests positive for COVID-19. On May 9, there were 2,643 CZs in the city and the rate at which cases are increasing, by this time the total number of CZs would have crossed 3,000. However, as per the new list, the city has a total of 1,963 CZs of which 692 are in slum pockets.