ബനാറസ് ഹിന്ദു സർവ്വകലാശാലയും സെൻഡർ ഫോർ ക്രോണിക്ക് ഡിസീസ് കൺട്രോളും സംയുക്തമായി നടത്തിയ പഠനം പ്രകാരം ഇന്ത്യയിൽ വായു മലിനീകരണം മൂലമുള്ള മരണസംഖ്യ ഏറ്റവും കൂടുതലുള്ള നഗരം ഏത് ?
Aഡെൽഹി
Bമുംബൈ
Cകൊൽക്കത്ത
Dചെന്നൈ
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