Tonga as an air pollution mortality rate of 73.3 per 100,000 population. The mean annual exposure of PM2.5 in Tonga is 10.8 mg/m³, endangering 99.8% of its population according to the World Health Organisation guidelines.
The territory of Tonga has a surface area of 750 km², 720 of which being land area. Forests represents 12.5% of the land with 90 km². Around 1.5% of territorial waters are protected marine areas.
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