Air pollution across the Indo-Gangetic Plains and Himalayan Foothills— which comprises parts of Bangladesh, Bhutan, India, Nepal, and Pakistan—is one of the most pressing health and development challenges in South Asia.
Nearly one billion people are exposed to hazardous air every day, leading to around one million premature deaths annually and shortening average life expectancy by more than three years.
The economic cost is immense, with an estimated 10 percent of regional GDP lost to reduced productivity, illness, and related damages.
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I'd normally put this in the International Economics section of the board but it's too good an example of a negative externality with considerable scope, affecting, as it does, 1 billion people.
The clip is pretty brutal in identifying the adverse effects on public health and the economic cost, equivalent to 10% of regional GDP on an annual basis.