Air pollution levels rising in many of the world's poorest cities

More than 80% of people living in urban areas that monitor air pollution are exposed to air quality levels that exceed WHO limits. While all regions of the world are affected, populations in low-income cities are the most impacted. According to the urban air quality database, 98% of cities in low- and middle income countries with more than 100 000 inhabitants, do not meet WHO air quality guidelines.