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What’s the green stuff? How to identify harmful algal blooms

These cyanobacteria are common in Pennsylvania waters during the summer months. Harmful algal blooms often form thick surface layers that resemble spilled paint. As these layers form on water surfaces, wind and waves push them toward the shorelines creating a swirly, layered look. (Photo courtesy U.S. EPA)

These cyanobacteria are common in Pennsylvania waters during the summer months. Harmful algal blooms often form thick surface layers that resemble spilled paint. As these layers form on water surfaces, wind and waves push them toward the shorelines creating a swirly, layered look.

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