The air quality in Delhi-NCR improved slightly on Friday (October 31) and was in the 'poor' category.

The air quality index at Akshardham and India Gate reached 269 and 218, respectively, according to the Central Pollution Control Board (CPCB).

Experts said the yellowish smoke enveloping the city is smog -- a mixture of fog and pollutants that reduces visibility and poses serious health risks, especially for vulnerable groups.

According to the IMD's Decision Support System, Delhi's transport sector contributed around 15.9% to PM2.5 levels, while stubble burning accounted for about 6% and emissions from Delhi residents around 4%.

Weather experts attributed the rise in pollution to meteorological conditions that trap pollutants near the surface.

"The dip in minimum temperature helps in

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