The World Air Quality Report 2024 shows that Byrnihat, a small town in India, is the most polluted city in the world. Only 17% of global cities meet WHO's air pollution guidelines. Several Indian cities, including Delhi, are among the top 20 most polluted. The high pollution levels severely impact health, and local authorities have begun taking action.The World Air Quality Report 2024 shows that Byrnihat, a small town in India, is the most polluted city in the world. Only 17% of global cities meet WHO's air pollution guidelines. Several Indian cities, including Delhi, are among the top 20 most polluted. The high pollution levels severely impact health, and local authorities have begun taking action.