A zoologist with the Meghalaya Pollution Control Board tests the acidity of the Lukha River. The otherwordly blue waters had a pH of 4.5, sufficient acidity to kill fish. (Dhruv Malhota/Contact Press Images for Circle of Blue)

A zoologist with the Meghalaya Pollution Control Board tests the acidity of the Lukha River. The otherwordly blue waters had a pH of 4.5, sufficient acidity to kill fish. (Dhruv Malhota/Contact Press Images for Circle of Blue)

Verify your email

We'll send a verification code to .

Sign up for newsletters

Get the best of Circle of Blue directly in your email inbox.

Sending to:

Gift this article