Most populous country India; By mid-April, the forecast is for India to overtake China as the world's most country.

A new study concludes that 86% of the world's city dwellers (2.5 billion people) are exposed to annual average levels of fine particles that exceed the World Health Organization (WHO) guideline since 2005

Delhi's population increased by 50%; In the last 20 years in Delhi, the population has increased by about 50 percent, but during this period