Pakistan, Dec. 15 -- Dense toxic smog engulfed New Delhi on Monday, pushing air quality to hazardous levels and forcing authorities to impose strict measures to protect residents from severe health risks.

More than 40 flights were cancelled, and dozens of trains arriving or departing from the capital faced multi-hour delays, highlighting the widespread disruption caused by the extreme pollution in the region.

Hospitals reported a surge in patients suffering from breathing difficulties and eye irritation, prompting healthcare experts to advise residents to avoid outdoor activities and use N95 masks whenever stepping outside.

Air quality index readings reached 449, far above the safe level of 50, marking the worst pollution levels in wee...