Question

What country has the most pollution?

Answer 1

Pakistan!

Explanation:

Per the latest WHO official publication (2014).
https://www.care2.com/causes/the-top-5-most-polluted-countries-in-the-world.html

and
http://www.news.com.au/travel/world-travel/countries-with-the-worst-air-pollution-ranked-by-world-health-organisation/news-story/524a5b1df6311d122892c0b7de940934