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.
Most polluted cities based on PM2.5 air pollution in 2016 (in micrograms per cubic meter)
Average PM2.5 concentrations in selected major cities worldwide in 2025 (in micrograms per cubic meter of air)
Average PM2.5 concentration in the most polluted capital cities worldwide in 2025 (in micrograms per cubic meter of air)
Air pollution in selected cities around the world in 2007
Average PM2.5 concentration in the most polluted cities worldwide in 2025 (in micrograms per cubic meter of air)
Average annual concentration of fine particulate matter PM2.5 worldwide in 2024, in cities with the highest particle concentration (in micrograms per cubic meter)
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