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AI-generated illustration: Chemical / industrial accident

Chemical / industrial accident

Shelter in place: close windows, shut ventilation, go upstairs for many heavy gases — leave only if told.

General risk

Chemical or industrial accidents (Seveso-type sites, transport spills, warehouse fires) can release toxic smoke or gas. You may smell something unusual, see a coloured cloud, or hear sirens and official alerts. The default public protection in Europe is often shelter-in-place: get indoors, close everything that lets outside air in, and wait for clear instructions. Some gases are heavier than air and collect low; going to a higher floor can help. Never drive through a visible cloud. In a life-threatening situation, call 112 and say what you see and smell if you can do so safely.

When it is happening

Only if this scenario is imminent or already underway — not everyday preparation. For prep ahead of time, see How to prepare and the checklist below.

If there is a chemical release nearby

  1. 1Go indoors at once — do not stay to watch or film.
  2. 2Close all windows, doors, chimneys and vents; switch off air conditioning, kitchen hoods and any system that pulls outdoor air.
  3. 3Go to an upper floor if the gas is said to be heavy or you see a low cloud; for lighter smoke, follow official advice.
  4. 4Seal obvious gaps with wet towels or tape only if guidance allows and you have time.
  5. 5Turn on radio / warning app; do not use outdoor air to "air the room".
  6. 6Call 112 if people are collapsing, cannot breathe, or you cannot reach shelter.

If you are outdoors or in a vehicle

  1. 1Move cross-wind and uphill away from the source if you can identify it safely.
  2. 2Do not drive through a visible plume or smoke bank.
  3. 3If trapped in a car in a cloud: windows closed, climate control set to recirculate (or fully off — do not pull in outside air), leave the area when safe.
  4. 4If chemicals contact skin or eyes, rinse with clean water for at least 15 minutes when you reach safety and seek medical help.

After the all-clear

  1. 1Open and ventilate only when authorities say it is safe.
  2. 2Follow advice on food, water and whether to discard outdoor-stored items.
  3. 3Seek medical care for lasting eye, skin or breathing problems.

Important safety warnings

  • Do not use outdoor air "for a breath of fresh air" during a release — that defeats shelter-in-place.
  • Do not light flames or smoke if a flammable gas release is possible.
  • Do not evacuate into a cloud unless fire or building collapse forces you out.
  • Contact with unknown chemicals: avoid tasting, smelling closely, or wiping eyes with contaminated hands.

How to prepare

Know local industrial risk

  1. 1Check whether you live or work near a Seveso / major-accident industrial site and know the public siren meaning.
  2. 2Install the official warning app and enable cell broadcast.
  3. 3Practise closing the home shell: windows, vents, AC, extractor fans — in under two minutes.

Shelter kit

  1. 1Bottled water, radio, torch, phone charger / power bank.
  2. 2Wet towels or plastic and tape for temporary sealing if local guidance recommends it.
  3. 3Medicines and a simple first-aid kit.

Good to know

  • 112 is free across the EU, works with no credit and on any available network — in some countries also without a SIM, but do not rely on that.
  • Many EU industrial sites have public information duties under the Seveso III Directive.
  • Toxic smoke from warehouse fires can travel far — distance is not always safety without shelter.

Preparedness checklist

The concrete steps for this scenario. Add them to a plan to track your progress.

Actions

  • Official warning app + sirens understoodEssential

    A chemical release is announced through several channels at once, so cover more than one. Install your national warning app, enable EU-Alert cell broadcast in your phone settings, and learn your local siren tones — in Germany a one-minute rising-and-falling tone means danger, and a continuous tone is the all-clear.

  • Practise sealing home in under 2 minutesEssential

    Sealing fast is what makes shelter-in-place work, because a toxic cloud can arrive in minutes but often passes within hours. Walk through it once for real: close every window and door, switch off ventilation, gather everyone in one room — then time yourself and repeat the drill once or twice a year.

Supplies

  • Bottled water for shelteringEssential

    Shelter-in-place can last hours, and opening the door to shop defeats it. Keep sealed bottled water in or near your shelter room — plan around 2 litres per person per day; unopened mineral water stored cool and dark keeps well past its best-before date, and self-filled containers need refreshing about every six months.

  • Battery radio and torchEssential

    The all-clear after a release comes over radio and official channels, and phone networks may be congested. A battery radio with a dual FM and DAB+ tuner plus an LED torch covers you; store spare batteries outside the devices so leaking cells can't ruin them, and a combined crank or solar model adds backup.

  • First-aid kit and regular medicines

    While you are sealed in, nobody can fetch supplies, so keep them on hand. A household kit stocked to the DIN 13157 benchmark (sterile compresses, dressings, gloves) covers minor injuries; add your regular prescription medicines — official German guidance suggests about a ten-day supply — and check expiry dates yearly.

Know & check

  • Know AC / hood / vent shut-offsEssential

    Even with every window shut, mechanical systems keep drawing outside air in. Find the switches or fuses for your air conditioning, extractor hood, bathroom fans and any central ventilation now, and label them, so you can stop all airflow within moments of a warning.

  • Know upper-floor shelter option for heavy gases

    Many toxic gases, such as chlorine, are heavier than air and pool at street level and in cellars — so unlike in a fire, higher is often safer. Pick a closable upstairs room as your fallback shelter, and avoid basements during a gas release unless authorities direct otherwise.

  • Check nearby Seveso / industrial sites

    Under the EU's Seveso III Directive, sites handling large quantities of hazardous substances must inform the public about their risks and alarm signals. Check whether any operate near your home or workplace — national and regional registers list them — and read the emergency leaflet upper-tier sites give neighbours.

Which plan?

Add this scenario to an existing plan — or create a new one.

    Official sources

    Content last reviewed: July 24, 2026