DHAKA — Air pollution in Bangladesh is the worst in the world, contributing to a reduction of nearly seven years in the average life expectancy, according to a new study. In the most polluted areas of the country, life expectancy is reduced by 8.1 years, according to the Air Quality Life Index (AQLI) study conducted by the Energy Policy Institute at the University of Chicago, which also ranked Bangladesh as the country with the world’s worst air pollution every year since 2018. Air pollution levels here exceed both national and global standards, and have gotten worse over the past two and a ha…