India's extreme air pollution causes toxic foam on Yamuna river
Extreme air pollution in India is causing large amounts of white, toxic foam to form on New Delhi's Yamuna river. This comes four days after officials declared a health emergency over toxic air levels. Despite the chemical foam, worshippers taking part in a regional Hindu festival entered and prayed in the river. Strong winds in the region have helped to decrease the air's toxicity levels, which were previously 10 times the recommended World Health Organization level.