Silenced sirens and unfinished shelters; Metropolitan security challenges against aerial threats The gap between expert warnings and the speed of urban management has left metropolitan areas unsafe against aerial threats. After the experiences of the last wars, the Housing Research Center emphasized immediate measures such as the use of deep subway stations, multi-story parking lots, crisis sheds and the provision of temporary survival places, but city managers focused mainly on long-term projects. With the changing nature of modern warfare, traditional warning systems and mass gatherings have lost their effectiveness. Ahmed Fatmi, a member of the Social Committee of the Parliament, emphasizes the need to include the Annex on the construction of shelters and easy access in all construction permits, the construction of public shelters by municipalities and the creation of a centralized warning order. On the other hand, Mehdi Achararian, a member of the Tehran Municipality Council, announced the approval of the shelter bill in the city council and points out that the municipality does not have the authority to make decisions regarding emergency sirens and modern digital information methods have replaced the traditional methods. Full text of the channel.