Everyone knows bad air quality when they breathe it in, but how does it measure and compare across different capital cities? To get this information, the amount of particulate matter is measured to arrive at a number the residents are breathing in over a period of time. IQAir released their 2024 World Air Quality Report, looking at the concentration of PM2.5 (fine particulate matter) in capital cities around the world. The report applied population-based adjustments to standardize its results and calculated an annual average of the data. If a city exceeded the World Health Organization (WHO) safety guideline of five micrograms per cubic meter (μg/m³) for annual average PM2.5 levels, it meant potential health risks for its residents.
So, how did your capital city do? Click on to check out the top 30.