The World Air Quality Report 2023 is published by which organization?

According to Swiss organization IQAir's 2023 World Air Quality Report, Delhi is the most polluted capital city globally. India had an average annual PM2.5 concentration of 54.4 µg/m³, which placed it third in terms of air quality. The most polluted metropolitan area was Begusarai in Bihar, while Bangladesh and Pakistan fared worse. Lahore was the only Indian city not included in the top 11, with ten of them being extremely polluted. 96% of Indians live in areas where PM2.5 levels are higher than recommended by the WHO.