As air quality deteriorates in Delhi and Mumbai, questions are growing over pollution-control measures, unchecked emissions, construction dust and urban planning failures. Why do India's biggest cities continue to battle toxic air year after year? #AirPollution #DelhiPollution #MumbaiPollution #AirQuality #NDTV About NDTV (English news channel): NDTV is India's Most-Trusted News Broadcaster with the latest updates in news, sports, entertainment and much more from within India and around the world.