New IQAir data shows Pakistan recorded the highest PM2.5 levels last year, with India and China also dominating the world’s most polluted cities

The cities are ranked from the cleanest to the most polluted based on average fine particulate matter (PM2.5) concentrations over the past two calendar years.

The European Environment Agency characterizes Athens' air quality as 'moderate'

A report on air quality across 134 countries shows that only 7 meet the World Health Organization's annual PM2.5 guideline