Asia and the Pacific is at the center of a public health crisis, with about 4 billion people exposed to unhealthy levels of air pollution. It is a problem felt acutely in the Republic of Korea, where the mean exposure of the population to a toxic particle known as PM2.5 is the highest of any state in the Organization of Economic Cooperation and Development. PM2.5 levels in Seoul, the capital, are about twice those of other major cities in developed countries, though some particulate levels have been dropping in recent years.
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