According to the latest World Air Quality Report released by IQAir AirVisual, the most polluted country in 2019 was Bangladesh, with average annual PM 2.5 concentration of 83.3 μg/m³, followed by Pakistan, Mongolia, and Afghanistan. Of the 10 countries with the world’s dirties air in 2019 (Figure 1), eight are Asian countries, and the remaining two are in the Middle East. China … [Read more...] about 10 Countries with the World’s Dirtiest Air in 2019