Dr Gaurav Goel explains how polluted air can increase blood clotting, raising the risk of stroke. Why do emergency cases tend to rise between November and February? #NDTVLifeline #Health #AirPollution #Pollution #StrokeRisk 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.