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Tonga - Organic water pollutant

Organic water pollutant (BOD) emissions (kg per day)

The value for Organic water pollutant (BOD) emissions (kg per day) in Tonga was 366.54 as of 2004. As the graph below shows, over the past 13 years this indicator reached a maximum value of 366.54 in 2004 and a minimum value of 141.12 in 1994.

Definition: Emissions of organic water pollutants are measured by biochemical oxygen demand, which refers to the amount of oxygen that bacteria in water will consume in breaking down waste. This is a standard water-treatment test for the presence of organic pollutants.

Source: 1998 study by Hemamala Hettige, Muthukumara Mani, and David Wheeler, ""Industrial Pollution in Economic Development: Kuznets Revisited"" (available at www.worldbank.org/nipr). The data were updated by the World Bank's Development Research Group using the same methodology as the initial study.

Year	Value
1991	198.72
1992	225.71
1993	207.70
1994	141.12
2000	263.44
2001	293.10
2002	327.30
2003	341.48
2004	366.54

Organic water pollutant (BOD) emissions (kg per day per worker)

The value for Organic water pollutant (BOD) emissions (kg per day per worker) in Tonga was 0.34 as of 2004. As the graph below shows, over the past 13 years this indicator reached a maximum value of 0.34 in 2004 and a minimum value of 0.22 in 1991.

Definition: Emissions per worker are total emissions of organic water pollutants divided by the number of industrial workers. Organic water pollutants are measured by biochemical oxygen demand, which refers to the amount of oxygen that bacteria in water will consume in breaking down waste. This is a standard water-treatment test for the presence of organic pollutants.

Source: World Bank and UNIDO's industry database.

Year	Value
1991	0.22
1992	0.24
1993	0.26
1994	0.26
2000	0.30
2001	0.32
2002	0.31
2003	0.30
2004	0.34

Classification

Topic: Environment Indicators

Sub-Topic: Water pollution