According to World Health Organization, 92% of the world’s population are living with unsafe levels of air pollution, and more than 7 million premature deaths annually are linked to polluted air. It was estimated that the world’s population had reached 7.8 billion as of March 2020. However, over 70 percent of the world’s population live in the top 20 most populous countries. … [Read more...] about Air Pollution in Top 20 Most Populous Countries in 2019