Reuters
People work atop a building under construction as sun sets in Pyongyang, North Korea April 12, 2017.
An overwhelming majority of the world's population breathes polluted air, according to a new report from State of Global Air.
Ninety-five percent of the world's population lives in an area where the air quality does not meet the World Health Organization's healthy air guideline, which is PM2.5.
PM2.5 means particulate matter in the air - caused by motor exhaust or anything combustible - that is less than 2.5 micrometers.
The State of Global Air report also includes data detailing the number and rate of deaths attributable to air pollution in each country in 2016.
Below are the 13 countries with the highest death rates from air pollution: