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Satellite images show that smog in Pakistan can be seen from space, as the country battles record levels of air pollution.
Images from NASA Worldview show the east of the country cloaked in a toxic haze, with smog also reaching into India's northern regions and New Dehli.
Lahore, the capital of Pakistan's Punjab region and home to 14 million people, had an air quality index of more than 400 on Tuesday morning, according to IQAir, which tracks global air quality.
Any reading above 300 is considered hazardous - anything between 0 to 50 is considered good.
Earlier in November, parts of Lahore had a reading above 1,900, marking a record high.
IQAir also reported on Tuesday that the concentration of PM2.5 - microparticles that enter the bloodstream through the lungs and can cause cancer - in Lahore was more than 50 times above recommended guidelines.
The city in eastern Pakistan is often ranked as one of the worst places in the world for air pollution.
Regional authorities have banned most outdoor activities, ordered shops to close early, and closed schools and public spaces until 17 November in response to the air pollution.
Health officials said more than 40,000 people have already been treated for respiratory ailments, while hospitals in the region have reported an unprecedented rise in patients with eye and throat irritation and pink eye disease.
It comes as a UN agency warned the health of 11 million children in the Punjab region is at risk if efforts aren't made to tackle the toxic smog.
Abdullah Fadil, UNICEF's representative in the country, said in a statement: "Prior to these record-breaking levels of air pollution, about 12% of deaths in children under five in Pakistan were due to air pollution.
"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."
Several South Asian countries are engulfed by smog each winter as cold air traps dust, emissions and smoke from farm fires.
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Parts of India, Pakistan, Nepal and Bangladesh were forced to close schools and businesses last November over air pollution.
A month later, artificial rain was used in Lahore to tackle hazardous smog for the first time.
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