Delhi, Nov. 10 -- Hundreds of people staged a rare protest in Delhi on Sunday, demanding urgent action to tackle the city's worsening air pollution as air quality continues to deteriorate across the capital and nearby regions.

Over the past three weeks, Delhi's Air Quality Index (AQI), which measures PM 2.5 levels - fine particulate matter that can damage lungs - has remained between 300 and 400, 20 to 30 times higher than the World Health Organization's safe limit.

Protesters carried banners and chanted slogans calling on the government to act. Around 80 demonstrators were briefly detained near India Gate after police said they did not have permission to gather there, reports BBC.

Air quality in Delhi and its suburbs is poor year-roun...