Schools in Delhi are closing indefinitely as the Indian capital grapples with a toxic smog.
Diwali celebrations, along with seasonal crop burnings, have seen levels of the dangerous PM2.5 particles exceed the World Health Organisation’s safety guidelines.
PM2.5 is an air pollutant that is a concern for people's health when levels in the air are high.
On the air quality index, PM2.5 levels under one hundred are considered “acceptable,” however Delhi is experiencing levels just under 400 which is considered “severe.”