Potentially harmful blue-green algae has increased in lakes over the past week.

With current tropical conditions set to continue for another week, the situation is not likely to improve before the end of July or early August.

The Finnish Environment Institute (SYKE) has warned that the Gulf of Finland faces the risk of earlier and larger than usual blue-green algae blooms this summer – weather permitting. The environment agency says high levels of phosphorous have the potential to feed abundant toxic algal growths.