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CDC

Harmful Algal Blooms | CDC Features

CDC Features  Waterborne  harmful Algal Blooms  algae  cyanobacteria  scum 

Harmful algal blooms can produce toxins that are dangerous to people, animals, and the environment. Learn what harmful algal blooms are, how you and your pets should keep away from them, and what CDC is doing about them.

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NIEHS

Harmful Algal Blooms

health  research  science  environment  eating  weather  swimming  algal  agents  water  liver  temperature  Health Topics  breathing  harmful Algal Blooms  HAB  algae  fish  runoff  fertilizer 

A harmful algal bloom (HAB) occurs when toxin-producing algae grow excessively in a body of water. Algae are microscopic organisms that live in aquatic environments and use photosynthesis to produce energy from sunlight, just like plants. The excessive algal growth, or algal bloom, becomes visible to the naked eye and can be green, blue-green, red, or brown, depending on the type of algae.

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