Gdynia Śródmieście beach has been closed to swimmers due to a harmful algal bloom. Testing by the State Sanitary Inspection revealed the water is currently unsafe for bathing. The closure is a precautionary measure to protect public health, as certain algae can produce toxins. This bloom, known as cyanobacteria or blue-green algae, is common in warm, nutrient-rich waters. Authorities will continue to monitor water quality and will reopen the beach when conditions improve. Swimmers are advised to avoid the area until further notice. The situation highlights the increasing frequency of algal blooms linked to climate change and pollution.