The Indian capital on Friday kicked off a sweeping plan to reduce its record-high air pollution by limiting the numbers of cars on the streets for two weeks.
Italy's centre-left government on Wednesday authorised local authorities to cut traffic speed limits by 20kph (12 mph) and office heating by two degrees in response to spikes in deadly air pollution.
Parts of China's capital Beijing suffered air pollution more than 20 times recommended levels on Tuesday, but authorities refrained from issuing the highest smog alert.
Beijing residents woke up to a white Christmas Friday morning but with the sky obscured by thick toxic smog rather than snow after more than 100 million people across China had been warned to stay indoors.
Naquela Wright's life took an unexpected turn when she lost her eyesight as a teenager, but even when her world became immersed in darkness, the New Jersey resident didn't want to quit social media.
Nanjing's purple haze has put a spell on Chinese social media as much of the country suffers its latest bout of choking smog.
Iran is to close schools for two days in Tehran, an official said on Saturday, following air pollution three times the acceptable level that has blanketed the city in smog.
For 12 hours a day, Raju Misra stands at his snack stall in the world's ultimate pollution blackspot, inhaling toxic fumes and railing against India's politicians for failing to clean up the filthy air.
Beijing issued its second-ever red alert for smog and put its emergency response plan into action once again as severe pollution hit China's capital on Saturday.
China's capital Beijing issued its second smog red alert of the month on Friday, triggering vehicle restrictions and forcing schools to close.