Air Pollution
How air pollution varies across the world's cities
How does air pollution vary across the world's cities? According to the World Health Organization, PM2.5 (micrograms per cubic meter) levels are highest in Asia and the Middle East. Delhi has the very worst air pollution levels of any city in the world with a PM2.5 level of 122. By contrast, Rome only has a PM2.5 level of 17.
Annual average PM2.5 exposure levels worldwide 2000-2023
Annual average PM2.5 concentrations worldwide 2000-2022, by region
Air quality levels in Delhi India 2016-2023, by number of days
Population of Delhi metro area India 1980-2025
Population growth rate of Delhi India 1960-2025
GSDP of Delhi at constant prices FY 2012-2025
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