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In the year 2019, according to the statistics by the World Health Organization (WHO), 99% of the population worldwide lived in placeswhere the air quality guidelines levels set by the WHO were not met. Additionally, more than 90% of the population around the globe lived in areas where PM2.5 concentrations exceeded the 2005 annual WHO air quality guidelines (AQG) of 10 u00b5g/m3 in the year 2019.
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