Air pollution is a multifaceted problem – representing the world’s leading environmental risk to health and costing the globe an estimated $8.1 trillion in 2019 , 6.1 percent of global gross domestic product (GDP). Air pollution is also deadly, causing or contributing to heart attacks, strokes, lung cancer, and respiratory diseases and killing an estimated seven million people every year – with about 95 percent of these deaths occurring in low- and middle- income countries. COVID-19 is only making matters worse, with research finding links between air pollution and COVID-19 hospitalizations and deaths. Read more...