That Siren From Every Phone at Once Is Korea's Emergency Alert System. Only One of Its Three Tiers Can't Be Silenced.

It is 6:58 on your first morning in Korea. Your phone — set to silent, because you are jetlagged and civilised — suddenly produces a noise you have never heard it make, over a wall of Korean text. Around you, a hundred other phones are doing the same thing. Nobody looks alarmed. Welcome to 재난문자, Korea's emergency alert system, one of the most aggressive in the world — and one of the most misunderstood by visitors.

Quick answer: there are three tiers of Korean emergency alerts. The highest (위급, for things like air-raid warnings) sounds at 60 decibels or more and cannot be turned off. The middle tier (긴급 — terror, extreme rain) alarms at 40dB and can be disabled in settings. The lowest and by far most common (안전안내, safety advisories — heat, cold, dust, lost persons area notices) rings like a normal message and can also be disabled. Nearly everything that startles you will be this third kind. Verified 2026-08-18.

The three tiers, in one table

TierWhat it coversSoundCan you opt out?
위급재난문자 (Critical)Air-raid and wartime-level warnings60dB+ sirenNo
긴급재난문자 (Urgent)Terror, radiological events, extreme rain (50mm/hour or 90mm/3 hours)40dB alarmYes
안전안내문자 (Safety advisory)Heatwaves, cold snaps, fine dust, most day-to-day alertsNormal message toneYes

Alerts are sent by the Ministry of the Interior and Safety, the weather service and local governments, each for their own domains — which is why a summer day can bring one from the city and another from the district you happen to be standing in. The system dates to a 2004 pilot, went national in 2005, and peaked during the pandemic: 54,383 messages in 2020 alone.

The real problem for visitors

The alerts are Korean-only, capped at 90 characters. There is no English in the broadcast itself — a gap Korean media have criticised for years. So the practical skill is not reading the message; it is triaging it:

  • Normal message tone, long Korean text → almost certainly a safety advisory: heat, dust, a missing-person notice for the area. Translate at leisure, or not at all.
  • A genuine alarm sound at volume → the rarer tiers. Put the text into a translation app immediately, and do what the locals around you do.
  • Want English proactively? The government's Emergency Ready app (안전디딤돌) pushes disaster information in English — the official companion for exactly this situation.

If the alerts are too much

On both Android and iPhone the emergency-alert toggles live in the notification settings; the two lower tiers can be switched off there. My honest advice: leave the top two on and silence only the advisories if you must — the system is loud precisely because, on the rare day it matters, it is the fastest warning you will get in Korea.

This article was verified on 2026-08-18. If you find something here that's changed, I'd like to know, through the contact page.

Sources and last verification

Prices, fares and hours in Korea change often. Everything above was checked against these sources on the dates shown. If you spot something out of date, please tell me via the contact page.

About the author — H.I. Kang

I was born in Korea and still live here. Travelling abroad, I have been the person stuck at a ticket machine in a language I could not read, holding up the queue and guessing — and I know how small a thing it takes to ruin an afternoon. This site exists so that visitors to Korea do not have to guess. Every price, route and rule here is checked against an official source before it is published, and dated so you can see how current it is.

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