Particulate air pollution in the Copenhagen metro part 1: Mass concentrations and ventilation by Niklas Kappelt, Hugo S. Russell, Dafni Fessa, Keith Van Ryswyk, Ole Hertel, Matthew S. Johnson

“…The Copenhagen Metro comprises four lines, the M1, M2, M3 and M4, with 25 subterranean stations and an additional 14 stations above ground, serving ca. 80 million passengers annually. …”
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Effects of Job Accessibility Improved by Public Transport System: Natural Experimental Evidence from the Copenhagen Metro by Gabriel Pons Rotger, Thomas Sick Nielsen

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Particulate air pollution in the Copenhagen metro part 2: Low-cost sensors and micro-environment classification by Hugo S. Russell, Niklas Kappelt, Dafni Fessa, Louise B. Frederickson, Evangelos Bagkis, Pantelis Apostolidis, Kostas Karatzas, Johan A. Schmidt, Ole Hertel, Matthew S. Johnson

“…In this study fine particulate matter (PM2.5) levels throughout the Copenhagen metro system are measured for the first time and found to be ∼10 times the roadside levels in Copenhagen. …”
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Cost Overruns and Demand Shortfalls in Urban Rail and Other Infrastructure by Flyvbjerg, B

“…Benchmarking of the Copenhagen Metro is presented as a case in point. The approach developed is proposed as a model for other types of policies and projects in order to improve economic and financial risk assessment and management in policy and planning.…”