A widespread bloom of toxic cyanobacteria, commonly known as blue-green algae, has been detected throughout much of the Baltic Sea. These algae produce toxins that can cause fever and other health problems in humans and animals. Authorities are monitoring the situation closely, advising against swimming in affected areas and warning pet owners to keep animals away from the water. The bloom’s extent is currently significant, impacting a large portion of the sea. The presence of these toxins poses a risk to recreational water users and potentially to the Baltic Sea ecosystem. Further monitoring and analysis are underway to assess the bloom’s duration and potential impact.