We often take the air we breathe for granted, but new data reveals that the pollutants behind millions of preventable deaths now taint the air most of us breathe at unhealthy levels.
"Air pollution has an impact at a much lower level than previously thought," says World Health Organization technical officer Sophie Gumy, in reference to WHO's recently updated air quality guidelines.
Based on an analysis of air pollution data covering more than 6,000 cities in 117 countries, WHO says 99 percent of the world's population now breathes air that does not meet the updated safety guidelines. This covers 80 percent of the world's urban areas.
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