Sierra Leone as an air pollution mortality rate of 324.1 per 100,000 population. The mean annual exposure of PM2.5 in Sierra Leone is 21.6 mg/m³, endangering 100.0% of its population according to the World Health Organisation guidelines.
The territory of Sierra Leone has a surface area of 72300 km², 72180 of which being land area. Forests represents 43.1% of the land with 31076 km². Around 0.5% of territorial waters are protected marine areas.
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