Indicator database

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    Freshwater quality

    This indicator shows:

    1. Annual median concentrations in rivers of Biological Oxygen Demand (BOD) and ammonium (NH4).

    2. Trends in concentrations of orthophosphate and nitrate in rivers, total phosphorus and nitrate in lakes, and nitrate in groundwater bodies.

    Units

    The concentration of nitrate is expressed as mg nitrate (NO3)/l for groundwater and mg nitrate-nitrogen (mg NO3-N/l) for rivers and orthophosphate and total phosphorus as mg P/l.

    Physical Trade Balance (PTB)

    The trade surplus or deficit of material resources within an economy, calculated as imports minus exports of raw materials and manufactured products.

    Total wealth estimate ($)

    "The Wealth of Nations dataset provides country level data on comprehensive wealth, adjusted net saving, and non-renewable resource rents indicators, as published in "The Changing Wealth of Nations" (2011)."
    (World Bank, http://data.worldbank.org/data-catalog/wealth-of-nations, 23-01-2015)

    "Total wealth is present value of future consumption that is sustainable, discounted at a rate of time preference of 1.5 percent, over 25 years.

    Depletion Adjusted Saving (DAS) =

    Population density (people per sq. km of land area)

    Population density of a country is midyear population divided by land area in square kilometers. Population is based on the de facto definition of population, which counts all residents regardless of legal status or citizenship--except for refugees not permanently settled in the country of asylum, who are generally considered part of the population of their country of origin. Land area is a country's total area, excluding area under inland water bodies, national claims to continental shelf, and exclusive economic zones.

    GDP per capita (current US$)

    "GDP per capita is gross domestic product divided by midyear population. GDP is the sum of gross value added by all resident producers in the economy plus any product taxes and minus any subsidies not included in the value of the products. It is calculated without making deductions for depreciation of fabricated assets or for depletion and degradation of natural resources. Data are in current U.S. dollars."

    (Worldbank, http://data.worldbank.org/indicator/NY.GDP.PCAP.CD, 2014-12-11)