We often act like all we need to survive is food, some good beer and maybe a few desserts, but do you know what we really need? Air.
More than 80 percent of the Earth's urban residents are breathing unhealthy air. They're living in cities with lots of cars, trucks and fossil fuel-burning power plants. Be it Peshawar in Pakistan, Beijing in China, or Delhi in India.
However, a recent study by the Indian Institute of Technology-Delhi (IIT-D) revealed that the Kinnaur district in Himachal Pradesh has the cleanest air in the country, whereas Delhi is the most polluted.