Schools ordered to close in Delhi and Punjab province as neighbouring countries battle dangerous air pollution

India’s capital, Delhi, has ordered all primary schools to cease in-person classes until further notice because of an air pollution crisis that has also prompted Pakistan’s Punjab province to declare a health emergency and ban construction, shut schools for another week and move universities online.

Delhi and the surrounding metropolitan area, home to more than 30 million people, consistently tops world rankings for air pollution in winter. It is estimated to reduce life expectancy for the capital’s residents by up to seven years.