Where is smog the worst in the world?

India, the third country on the list, experiences PM2.5 levels of 47.13 micrograms per cubic meter. While slightly lower than the previous two countries, this level still poses a considerable threat to public health and warrants immediate attention.

The UChicago ACLI 2020 list highlights the issue of air pollution, specifically focusing on particulate matter (PM2.5) levels in various countries. This pollutant, with a diameter of 2.5 micrometers or less, poses significant health risks when present in high concentrations.

Bangladesh ranks first on the list, with a staggering PM2.5 concentration of 76.90 micrograms per cubic meter. This level far exceeds the World Health Organization's (WHO) recommended guideline of 5 micrograms per cubic meter, indicating severe air pollution in the country.

Following closely behind is Pakistan, with a PM2.5 level of 55.80 micrograms per cubic meter. This figure also significantly surpasses the WHO's guideline, underscoring the urgent need for action to address air pollution in the region.

Afghanistan rounds out the top four countries with a PM2.5 concentration of 44.17 micrograms per cubic meter. Despite its position on the list, the nation faces similar challenges in mitigating air pollution and protecting its citizens from its harmful effects.