Cyanotoxins in Air STudy

The CDC’s National Center for Environmental Health (NCEH) is conducting a study in Florida to assess the health effects of exposure to cyanotoxins in the air. This study, called the Cyanotoxins in Air Study (CAST), will assess the health effects of cyanotoxins among people who live or work on

  • Lake Okeechobee,
  • St. Lucie River,
  • Caloosahatchee River, and
  • Cape Coral Canals.
Overview of the Cyanotoxins in Air Study (CAST)
The coast on the surface of the river is covered with a pellicle of blue-green algae.

Learn more about CAST, including eligibility criteria and what study participants can expect.

General Information About Algal & Cyanobacterial Blooms
Cyanobacteria or "blue-green" algae, Frampton on Severn, Gloucestershire, UK

Learn what causes algal and cyanobacterial blooms, possible health effects, and how to protect yourself.

Contact Information


For questions about the Cyanotoxins in Air Study (CAST), please call 561-297-4631 or email

For general information about  harmful algal and cyanobacterial blooms, please contact CDC-INFO at 800-CDC-INFO (800-232-4636); TTY 888-232-6348.

Page last reviewed: March 16, 2021