Indeed, there is a programme using Copernicus images to monitor the algal blooms in the Baltic Sea, aiming to provide warnings in case the blooms drift close to coasts where they can be harmful to human health. https://marine.copernicus.eu/services/use-cases/monitoring-harmful-algal-bloom-baltic-sea-hab-risk-service

@markmccaughrean I was home sick from school and watched the explosion played on tv - not with the single-minded repetitive ferocity of today, but still at least once or twice every hour.