The test will begin with the sending of an alert to mobile phones informing of the drill. A few minutes later, the chemical risk sirens will be activated with the confinement sound, characterized by a wavy tone similar to an ambulance siren. This initial alert sound consists of three one-minute signals separated by five-second silences. Subsequently, the end-of-confinement sound will be emitted, a flat, higher-pitched tone.
It is expected that individuals inside buildings may not hear the siren sounds, as they are designed to alert those outdoors. Therefore, Civil Protection recommends using the drill as an opportunity to act as if it were a real emergency, seeking a safe place and sheltering if on the street.
The sound of mobile alerts and sirens may cause discomfort to individuals with noise hypersensitivity. For such cases, noise-canceling headphones are recommended.
In the event of a real accident at an industrial facility, the purpose of this warning system is to quickly alert the population in the vulnerable zone. This would allow for the implementation of confinement or evacuation measures, such as taking shelter at home or in the nearest building, closing doors and windows, disconnecting ventilation systems, and awaiting the end-of-alert notification.
