No, that’s not pollution. What you’re seeing is actually a type of algae, known as noctiluca scintillans, which glow blue and are tear like in shape, causing people to call them “blue tears,” and even compare it to a lava lamp.

You can check out this stunning sight along the coast of Matsu Island in Taiwan, potentially year-round. Though, you can usually see it in the warmer months near river mouths and after heavy rain.

“This represents a kind of ecological balance, and the appearance of noctiluca scintillans is therefore far from an indication of environmental deterioration,” said Chiang Kuo-ping, director of the Institute of Marine Environment and Ecology at the National Taiwan Ocean University.

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