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United Nations Environment Programme ,  [Reactive nitrogen in the environment] ,  Reactive nitrogen in the environment

United Nations Environment Programme ,  [UNEP Year Book 2014: emerging issues in our global environment] ,  UNEP Year Book 2014: emerging issues in our global environment

European Environment Agency ,  [Air quality in Europe: 2015 report] ,  Air quality in Europe: 2015 report

Yale University, World Economic Forum and CIESIN ,  [Global metrics for the environment: The Environmental Performance Index ranks countries‘ performance on high-priority environmental issues] ,  Global metrics for the environment: The Environmental Performance Index ranks countries‘ performance on high-priority environmental issues