New Delhi is the most polluted city on Earth right now

Story highlights

  • Some parts of Delhi record air quality index of 999
  • City has instituted emergency measures to tackle smog

(CNN)Fresh air doesn't exist in New Delhi at the moment.

India's capital is choking under off-the-charts smog, with some parts of the city reporting levels almost five times those considered "unhealthy" by the US environmental protection agency.