It's worth keeping in mind that urban activity accounts for only ~20℅ of the particulate matter in Delhi. Take a look at the following graph. Other major Indian

It's worth keeping in mind that urban activity accounts for only ~20℅ of the particulate matter in Delhi. Take a look at the following graph. Other major Indian cities like Mumbai are run very similarly to Delhi, and yet, their levels are 80℅ lower. http://qz.com/829182/this-one-chart-shows-delhis-apocalyptic-pollution-compared-to-the-rest-of-india/ http://qz.com/829182/this-one-chart-shows-delhis-apocalyptic... There was a more detailed article I read a few months ago (nytimes?) that went into the geographical details of how regional airflow and weather patterns play a major role in explaining the huge variation you see in the above chart.