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https://greencitysolutions.de/wp-content/uploads/2025/03/k-yuanzhe-ma-397nBYBeqj8-unsplash-1-e1741890444783.jpg15001000According to the World Air Quality Report, 99 percent of the global population is exposed to levels of fine particulate matter and other pollutants that exceed the limits recommended by the WHO. Only 17 percent of cities met the World Health Organization's air quality guidelines.