Liestal acid spill: The warning is over, but odours may linger

The spill happened shortly before 14:00 local time at pharmaceutical premises in the Oristal industrial area, in the canton of Basel-Landschaft. Firefighters and chemical-response services attended alongside cantonal police. During the initial response, crews were trying to contain the vapour cloud.⁠11⁠1

The escaped liquid was a 37-percent hydrochloric acid solution, which formed corrosive vapour clouds. Alertswiss warned that a release of toxic substances had to be anticipated. For people living and working nearby, the immediate concern was therefore the air around the spill, not simply the liquid on the premises.⁠1⁠2

During the warning, people nearby were told to close windows and doors, switch off ventilation and air conditioning, and avoid the affected area. Those instructions belonged to the active warning. They should not be read as a fresh sheltering order issued after authorities said there was no current danger.⁠1⁠17

The later accounts describe a different situation. In an update published at 17:08, SWR reported police saying there was no longer a vapour cloud and no injuries. BZ’s report, updated at 17:25, said authorities had given the all-clear. SRF’s regional audio summary at 17:30 also reported that there was no longer any acute danger. Those are reporting times, however, not verified times for the official cancellation of the warning.⁠13⁠3⁠6

Alertswiss’s later message, reported by SRF and Swissinfo, allowed for residual odour while saying there was currently no danger. The important distinction is between an unpleasant smell that may remain and the corrosive cloud that prompted the earlier precautions. The later notice supersedes the immediate danger warning; the two messages describe successive stages of the response, not competing assessments of the same moment.⁠2⁠17

The available information does not establish a street-by-street warning area, a precise perimeter or an evacuation order. Nor does the reported absence of injuries establish how many people may have been exposed or medically assessed. No such count has been provided in the available accounts.⁠11⁠17

The amount of acid released is less settled than the immediate safety message. Initial SRF reporting put the spill at about 1,000 litres, and the updated SRF web article retained that figure even as it reported the all-clear.⁠1⁠2

Later reporting gave a lower estimate: about 800 litres. That figure appears in the police-attributed Nau account, BZ’s updated report and SRF’s 17:30 regional audio summary. No explanation for the difference has been supplied. The later estimate is the more recent assessment, but it is not an established final total.⁠11⁠3⁠6

These figures describe the same incident, not two releases. The defensible account is a large spill initially estimated at roughly 1,000 litres and later at roughly 800 litres. Choosing either number without that qualification would make the reporting look more settled than it is.⁠1⁠11⁠6

The company’s identity is also inconsistent across the reports: SRF’s regional summary names Drug’on, while other coverage names Dragon Pharma. The established location is the pharmaceutical premises in Liestal’s Oristal industrial area. The available accounts do not resolve the naming difference.⁠6⁠19

The cause of the release and the completion of cleanup remain unestablished. Those are now the outstanding issues, alongside a reconciled volume estimate. The response has moved beyond the public-warning phase; the account of what happened at the premises is still incomplete.⁠11⁠3