lead with 10 cities in India's top 16 worst; fireworks + 13 stubble fires propel NCR into "severe" crisis unseen in years.
PM2.5 dominates toxic cocktail; experts forecast respiratory surge as vulnerable groups hunker down amid Stage III construction bans.
South India inhales clean air (Bengaluru 97) while north suffocates; global rankings shame Delhi, fueling demands for crop residue tech and firecracker overhauls.