, Dec. 16 -- Dense smog shrouded India's capital on Monday, sending air pollution to its worst levels in weeks, disrupting travel, and forcing authorities to implement strict containment measures.

More than 40 flights were cancelled, dozens more delayed, and over 50 trains arriving and departing from New Delhi faced multi-hour delays, officials said.

Healthcare experts warned residents to avoid outdoor activities as hospitals reported a surge in patients suffering from breathing difficulties and eye irritation.

"New Delhi is like a gas chamber right now. Air purifiers offer limited relief, so the government must come up with long-term solutions," said Naresh Dang, a physician at Max Healthcare.

Delhi's air quality has remained at the ...