Since 2013, chemical oxygen demand (COD) emissions of the national railway in China was decreasing slowly to 1.76 thousand tons in 2019. COD is an indicator to show the amount of pollution in a water example. In this case, the higher the COD emission is, the more polluted the railway sewage.
Total volume of chemical oxygen demand (COD) emissions of the Chinese national railway from 2013 to 2019
(in 1,000 metric tons)
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National Railway Administration (China). (April 30, 2020). Total volume of chemical oxygen demand (COD) emissions of the Chinese national railway from 2013 to 2019 (in 1,000 metric tons) [Graph]. In Statista. Retrieved November 21, 2024, from https://www.statista.com/statistics/1037008/china-national-railway-chemical-oxygen-demand-emission-volume/
National Railway Administration (China). "Total volume of chemical oxygen demand (COD) emissions of the Chinese national railway from 2013 to 2019 (in 1,000 metric tons)." Chart. April 30, 2020. Statista. Accessed November 21, 2024. https://www.statista.com/statistics/1037008/china-national-railway-chemical-oxygen-demand-emission-volume/
National Railway Administration (China). (2020). Total volume of chemical oxygen demand (COD) emissions of the Chinese national railway from 2013 to 2019 (in 1,000 metric tons). Statista. Statista Inc.. Accessed: November 21, 2024. https://www.statista.com/statistics/1037008/china-national-railway-chemical-oxygen-demand-emission-volume/
National Railway Administration (China). "Total Volume of Chemical Oxygen Demand (Cod) Emissions of The Chinese National Railway from 2013 to 2019 (in 1,000 Metric Tons)." Statista, Statista Inc., 30 Apr 2020, https://www.statista.com/statistics/1037008/china-national-railway-chemical-oxygen-demand-emission-volume/
National Railway Administration (China), Total volume of chemical oxygen demand (COD) emissions of the Chinese national railway from 2013 to 2019 (in 1,000 metric tons) Statista, https://www.statista.com/statistics/1037008/china-national-railway-chemical-oxygen-demand-emission-volume/ (last visited November 21, 2024)
Total volume of chemical oxygen demand (COD) emissions of the Chinese national railway from 2013 to 2019 (in 1,000 metric tons) [Graph], National Railway Administration (China), April 30, 2020. [Online]. Available: https://www.statista.com/statistics/1037008/china-national-railway-chemical-oxygen-demand-emission-volume/
