Most polluted city in the world: On October 30

On October 30, 2025, forty of the world 's most polluted cities were in India. Smaller northern cities like Sri Ganganagar and Siwani recorded extreme pollution levels. New Delhi is the most polluted city in the world with an average AQI of 169, which is primarily caused by vehicular emissions, industrial activities, construction dust, and stubble burning in ... Explore the top 10 most polluted cities in the world 2024. Discover PM2.5 levels, smoking equivalents, and WHO guidelines. The 2025 World Air Quality Report by IQAir has not been published yet. However, real-time rankings of the most polluted major cities are currently shown on the IQAir website.