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Lahore and Multan, the province’s two main cities hit by smog, remained the two most polluted cities in the world on Wednesday, with air quality index readings of about 400, according to the Environmental Protection Department. Anything over 300 is considered hazardous to health.

The dangerous smog is a byproduct of large numbers of vehicles, construction and industrial work as well as burning crops at the start of the winter wheat-planting season, experts say.

Meanwhile, more than 200 clinics on board vehicles have been roaming the smog-hit province of Punjab since last week in search of people who can't afford treatment and the elderly who can't make it to hospitals, a top government official at the Health Department, Aun Abbas, said.

Abbas said the mobile clinics are equipped to handle basic laboratory tests and doctors onboard can prescribe medication as needed.

Uzma Bukhari, a spokesperson for the Punjab provincial government, said more than 2.1 million patients affected by smog have so far been treated at state-owned hospitals, adding the number is expected to grow.

Schools in the province have been ordered to shut down until Nov. 17, to protect children, and all until Nov. 18. Doctors have urged people to avoid unnecessary travel and wear face masks.

“Most patients with respiratory-related diseases are coming to hospitals because they did not wear face masks,� said Azam Mushtaq, a medical specialist at Nishtar Hospital in Multan told The Associated Press.

Asthma patients seemed to suffer the most as they had a hard time breathing even after being admitted and provided with oxygen support, according to an AP reporter on the scene.

However, many violate the mask mandate and are being fined by authorities. Traffic police also penalize drivers whose vehicles emit smoke.

Weather forecasters predict light rain in some of the areas in Punjab, which can help improve air quality. The government has also said it is looking into methods to induce artificial rainfall to combat the pollution in Punjab.

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Associated Press writer Babar Dogar contributed to this report from Lahore, Pakistan.