(FILES) A general view shows the Signature Bridge over the Yamuna River on a smoggy winter morning in New Delhi on December 20, 2024. Despite an improvement in 2024, India again dominated global rankings for the cities with the most dangerous particle smog while Chad was the most polluted country, according to a report published on March 11, 2025. The report by IQAir, a Swiss air technology company, said India's Byrnihat was the world's "most polluted metropolitan area of 2024". The Indian capital New Delhi was the world's most polluted capital, closely followed by Chad's N'Djamena. The Bangladesh capital Dhaka came third, ahead of Kinshasa and Islambad. (Photo by Arun SANKAR / AFP)
Yamena –en Chad– y Nueva Delhi son las dos capitales más contaminadas.