Air pollution is responsible for 6.4 million deaths per year.
"Air pollution is one of the world's largest killers, responsible for 6.4 million deaths per year (1 in 9 deaths), of which 600,000 are children. This is more than the number of deaths from AIDS, Malaria and tuberculosis combined."
Source: https://www.edf.org/health/health-impacts-air-pollution