Poor air quality can have many adverse effects on human health. Diagram below shows the most severe and common ones.
Approximately 91 % of global population breathes air, in which concentration of at least one pollutant exceeds the World Health Organization recommended maximum value.
World Health Organization estimates that poor air quality is annually responsible for 7 million premature deaths (4.2 due to poor ambient air quality, 3.8 million due to poor indoor air quality).