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Why Air Raid Sirens Sound Across China on September 18

Guide
Sep 16, 2026
Stone calendar-page monument at the 9.18 Historical Museum in Shenyang showing the date 18 September 1931

If you are in China on 18 September, you will probably hear something unsettling: air raid sirens rising over the whole city at once, for three minutes, then again, then a third time. Traffic may stop. Drivers may lean on their horns. Nothing is wrong. The sirens are announced weeks in advance by the city government, and they are a drill and an act of remembrance, not a warning.

Still, nobody tells you that in English before you arrive, and a wailing siren is a strange thing to decode from a hotel room. So this guide does two jobs. First, what you are hearing and what to do. Then the history the sound is for — 18 September 1931, the invasion that followed, and the dates every schoolchild here knows.

Air Raid Sirens in China: What You Are Actually Hearing

Chinese cities test their civil air defence sirens under the People’s Air Defence Law, and many choose 18 September for it. The test does two things at once. It proves the equipment still works, and it marks the anniversary. More than 100 cities sounded sirens on the date in 2025.

Three signals, each three minutes long

China’s air raid sirens run through three separate signals, and the sequence is fixed nationally, so once you know it the sound stops being ambiguous. Each signal runs three minutes, with seven minutes of silence between them (Beijing Municipal Office of National Defence Mobilization, 2019).

  • Pre-warning: 36 seconds on, 24 seconds off, repeated three times.
  • Air raid warning: 6 seconds on, 6 seconds off, repeated fifteen times — the urgent, choppy one.
  • All clear: one continuous tone, unbroken.

That third tone is your cue that the exercise has finished. In a real emergency the same three signals would carry their literal meanings, which is precisely why they are rehearsed.

The time depends on the city

Here is a detail that confuses visitors: there is no single national moment. Each city publishes its own schedule. In 2026, Changchun set 9:18 to 9:33 a.m., Xi’an and Jining chose 10:00 to 10:15, Huizhou 10:30, and Shenzhen ran 10:40 to 11:03 (Shenzhen Municipal People’s Government, 2026).

Northeastern cities favour 9:18 in the morning, for the date rather than the hour — the railway explosion of 1931 actually happened at about 10:20 at night. Some cities skip the drill altogether in a given year. If you want to know in advance, search your city’s name with 防空警报试鸣 a few days before.

What To Do When the Air Raid Sirens Sound

Nothing, essentially. Shenzhen’s 2026 public notice puts it plainly, and it addresses residents and visitors alike: keep your normal work and daily routine when you hear the sirens. Shops stay open, the metro runs, flights are unaffected, and no one will ask you to shelter.

  • Indoors: carry on. You may hear colleagues explain the date to each other.
  • On the street: expect people to pause. Standing still for a moment is normal and polite.
  • Driving: in some cities, notably Shenyang, vehicles stop and sound their horns for three minutes. Follow the car in front rather than the impulse to overtake.
  • Filming: fine in public. Avoid pointing a camera at individuals during a moment of silence.

One more thing worth knowing. This is a day of mourning rather than protest, so the mood in the street is solemn and brief, and then the city goes back to work. If you have just landed, our guide to your first 24 hours in China covers the other unfamiliar noises, from payment prompts to station announcements.

Why 18 September: The Night the Invasion Began

A staged explosion outside Shenyang

Late on 18 September 1931, officers of Japan’s Kwantung Army detonated a small charge on the Japanese-run South Manchuria Railway at Liutiaohu, near the city then called Mukden and now called Shenyang. The damage was trivial — about a metre and a half of one rail — and a train passed over the spot ten minutes later without trouble (Wikipedia, 2026).

The explosion was never the point. It was the pretext. By dawn on 19 September, Japanese artillery was firing on the Chinese garrison, and Shenyang was occupied by nightfall.

From one city to three provinces

Within five months, Japanese forces held the major cities of Liaoning, Jilin and Heilongjiang. In March 1932 they installed the puppet state of Manchukuo, with China’s last emperor, Puyi, as its figurehead. The League of Nations sent a commission; its Lytton Report of October 1932 rejected Japan’s self-defence claim, and Japan simply left the League in March 1933.

That is the sequence the sirens commemorate. An entire region was taken on a manufactured excuse, and the international system of the day proved unable to stop it. Today the site is the 9.18 Historical Museum, the focus of Shenyang’s annual ceremony — see our guide to Shenyang if you want to visit it.

The Fourteen Years, in Dates

Outside China the Asian war is often dated from 1937, or even 1941. Chinese textbooks date it from 1931 and count fourteen years, which is why this particular anniversary carries the weight it does.

  • 18 Sep 1931 — the Liutiaohu explosion; the occupation of the Northeast begins.
  • Mar 1932 — Manchukuo established.
  • 7 Jul 1937 — the Marco Polo Bridge incident near Beijing; full-scale war.
  • Aug–Nov 1937 — the battle for Shanghai, then the advance up the Yangtze.
  • 13 Dec 1937 — Nanjing falls; the massacre begins.
  • 15 Aug 1945 — Japan announces surrender.
  • 2 Sep 1945 — the instrument of surrender is signed aboard USS Missouri.
  • 9 Sep 1945 — the China theatre surrender ceremony, held in Nanjing.

Nanjing, December 1937

After Nanjing fell on 13 December 1937, Japanese troops killed civilians and disarmed soldiers over roughly six weeks. The postwar tribunal figure used in China is about 300,000 dead, and it is inscribed at the memorial hall built on a burial site in the city. Since a decision of the National People’s Congress Standing Committee on 27 February 2014, 13 December has been a national memorial day, marked with sirens in Nanjing and a ceremony at the hall.

The memorial is free to enter and, in the way of such places, quiet rather than rhetorical. Our guide to Nanjing explains where it sits in a day in the city.

The cost, and the end

Chinese official figures put the country’s military and civilian casualties across those fourteen years at about 35 million, roughly a third of the global total for the Second World War (The State Council, 2024). The same legislative package that created the December memorial day also fixed 3 September as Victory Day, the day after the surrender was signed in Tokyo Bay.

Those wartime decisions belong to the Japanese government and military of that period, and to the officers later convicted of war crimes. The anniversary is directed at that history — which is also why the modern ritual is a siren and a minute of stillness rather than a parade in most years.

Other Days You May Hear Air Raid Sirens in China

  • 3 September — Victory Day, marked nationally, with a military parade in anniversary years.
  • 13 December — the Nanjing memorial day, with sirens across that city.
  • Local anniversaries — many cities test on the date they were bombed or occupied, so the Chongqing, Jinan and Harbin dates all differ.
  • Routine tests — some places run a short equipment check on a set day each year, unrelated to any anniversary.

In every case, the notice comes first. A genuine emergency alert in China arrives on your phone, not only through a siren.

Frequently Asked Questions

Are the air raid sirens in China a real warning?

No. On 18 September they are a scheduled drill, published in advance by the local government, held under the People’s Air Defence Law.

Do I need to take shelter or stop what I am doing?

No. Official notices ask residents and visitors to carry on normally. Many people pause briefly out of respect, which you are welcome to do.

How long do the sirens last?

About 23 minutes from start to finish: three signals of three minutes each, separated by seven-minute gaps.

Will flights, trains or the metro be affected?

No. Transport runs to schedule. Road traffic may pause briefly in cities where drivers sound their horns.

Is it safe to be out as a foreign visitor that day?

Yes. It is a day of mourning, not of protest, and daily life continues around it.

Three Minutes, Once a Year

The first time you hear air raid sirens in China, the instinct is to reach for your phone and check the news. The second time, if you know the date, you notice something else — how completely a loud, ugly sound can stop a street of ten million people for three minutes, and how quickly the street starts again.

18 September 2026 falls on a Friday, and it is the 95th anniversary. If you are here for it, you now know what the tones mean, why they differ from city to city, and what happened on a railway embankment outside Shenyang that night in 1931.

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