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.
I've already talked about this a couple of times - just an application of D&S, with the macroeconomic environment determining the demand for gold as a safe haven.