This study, a meta-analysis of PEMS data from EU (Euro 6) and US (Tier 2 Bin 5/ULEV II) diesel passenger cars, documents the wide discrepancy that exists between official certification or type-approval emissions of nitrogen oxides (NOx) from new diesel passenger cars and actual NOX emissions from those vehicles during real-world, everyday operation. The study comes on the heels of a recent report showing that a similar gap between official and real-world emissions of CO2 from passenger cars in Europe widened to 38% in 2013—i.e., CO2 emissions (and fuel consumption) during everyday operation were on average more than a third higher than the certification values obtained for vehicles via laboratory type-approval test.
Links:
[1] http://admin.indiaenvironmentportal.org.in/reports-documents/real-world-exhaust-emissions-modern-diesel-cars
[2] http://admin.indiaenvironmentportal.org.in/category/author/vicente-franco
[3] http://admin.indiaenvironmentportal.org.in/category/author/francisco-posada-sanchez
[4] http://admin.indiaenvironmentportal.org.in/category/author/john-german
[5] http://admin.indiaenvironmentportal.org.in/category/author/peter-mock
[6] http://admin.indiaenvironmentportal.org.in/category/publisher/international-council-clean-transportation
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cars
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diesel
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/euro-vi
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/europe
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-standards
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[15] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[16] http://admin.indiaenvironmentportal.org.in/category/thesaurus/oxides-nitrogen-nox