The state has issued an advisory on the levels of blue-green algae in the Charles River that recommends limiting contact with river water and rinsing with fresh water should contact occur.
According to the Massachusetts Department of Public Health (MDPH), algae blooms of cyanobacteria (blue-green algae) can grow quickly in fresh water and produce toxins harmful to humans and animals.
The MDPH warns contact with these algae can cause skin and eye irritation; ingesting small amounts can cause gastrointestinal symptoms and ingesting large amounts of toxins may cause liver or neurological damage; inhaling water spray with algae in it can cause asthma-like symptoms; and small children and pets are more susceptible to the effects of toxins than adults.
The advisory is in effect until further notice, state officials said.