ISLAMABAD (AP) — The U.N. children’s agency on Monday warned that the health of 11 million children in Pakistan’s eastern Punjab province is in danger because of air pollution that experts say has become a fifth season in recent years.

Toxic smog has shrouded Pakistan’s cultural capital of Lahore and 17 other districts in Punjab since last month. Health officials say more than 40,000 people have been treated for respiratory ailments.

UNICEF’s representative in Pakistan, Abdullah Fadil, in a statement urged the government to make urgent and greater efforts to reduce air pollution for the 11 million affected children under the age of 5 and others.

“Prior to these record-breaking levels of air pollution, about 12% of deaths in children under 5 in Pakistan were due to air pollution,” Fadil said. “The impact of this year’s extraordinary smog will take time to assess, but we know that doubling and tripling the amount of pollution in the air will have devastating effects, particularly on children and pregnant women.”

Pakistan has shut schools until Nov. 17 in parts of Punjab as part of measures aimed at protecting children’s health. Authorities on Friday ordered the closure of all parks and museums for 10 days, and they have been urging people to avoid unnecessary travel.

UN warns that toxic smog in Pakistan's Punjab province is endangering children | iNFOnews.ca — Vehicles move slow on a road as smog envelops the area of Peshawar, Pakistan, Monday, Nov. 11, 2024. (AP Photo/Muhammad Sajjad)

According to the Environmental Protection Department in Punjab, Multan remained the most polluted city on Monday, with air quality index readings of about 800. Anything over 300 is considered hazardous to health.

Though the government has ordered the mandatory wearing of face masks, that has been widely disregarded. The government has also said it was looking into methods to induce artificial rainfall to combat the pollution.