It has been approximated that seven million people die due to air pollution, globally. The World Health Organisation (WHO) has reported that 90% of people breathe in highly polluted air and approximately 91% of the world’s population live in areas where air quality is extremely poor.

Coal as an energy source has powered the industrialization of many of the world cities since the 18th century, currently it remains a readily available energy source to meet the demands of several countries.