Real World Vehicle Emission Factors for Black Carbon Derived from Longterm In-Situ Measurements and Inverse Modelling
Open Access
- 29 December 2020
- journal article
- research article
- Published by MDPI AG in Atmosphere
- Vol. 12 (1), 31
- https://doi.org/10.3390/atmos12010031
Abstract
Black carbon (BC) is one of the most harmful substances within traffic emissions, contributing considerably to urban pollution. Nevertheless, it is not explicitly regulated and the official laboratory derived emission factors are barely consistent with real world emissions. However, realistic emission factors (EFs) are crucial for emission, exposure, and climate modelling. A unique dataset of 10 years (2009–2018) of roadside and background measurements of equivalent black carbon (eBC) concentration made it possible to estimate real world traffic EFs and observe their change over time. The pollutant dispersion was modelled using the Operational Street Pollution Model (OSPM). The EFs for eBC are derived for this specific measurement site in a narrow but densely trafficked street canyon in Leipzig, Germany. The local conditions and fleet composition can be considered as typical for an inner-city traffic scenario in a Western European city. The fleet is composed of 22% diesel and 77% petrol cars in the passenger car segment, with an unknown proportion of direct injection engines. For the mixed fleet the eBC EF was found to be 48 mg km in the long-term average. Accelerated by the introduction of a low emission zone, the EFs decreased over the available time period from around 70 mg km to 30–40 mg km. Segregation into light (3.5 t) vehicles resulted in slightly lower estimates for the light vehicles than for the mixed fleet, and one order of magnitude higher values for the heavy vehicles. The found values are considerably higher than comparable emission standards for particulate matter and even the calculations of the Handbook Emission Factors for Road Transport (HBEFA), which is often used as emission model input.
This publication has 36 references indexed in Scilit:
- Recommendations for reporting "black carbon" measurementsAtmospheric Chemistry and Physics, 2013
- Road vehicle emission factors development: A reviewAtmospheric Environment, 2013
- Black Carbon as an Additional Indicator of the Adverse Health Effects of Airborne Particles Compared with PM 10 and PM 2.5Environmental Health Perspectives, 2011
- Characterization and intercomparison of aerosol absorption photometers: result of two intercomparison workshopsAtmospheric Chemistry and Physics, 2011
- Detailed Investigation on Soot Particle Size Distribution during DPF Regeneration, using Standard and Bio-Diesel FuelsIndustrial & Engineering Chemistry Research, 2010
- Cardiovascular health and particulate vehicular emissions: a critical evaluation of the evidenceAir Quality, Atmosphere & Health, 2009
- Spatio-temporal variability and principal components of the particle number size distribution in an urban atmosphereAtmospheric Chemistry and Physics, 2009
- Particle number emissions of motor traffic derived from street canyon measurements in a Central European cityPublished by Copernicus GmbH ,2009
- Long-term observation of real-world road traffic emission factors on a motorway in SwitzerlandAtmospheric Environment, 2006
- Kinematics and dispersion characteristics of flows in asymmetric street canyonsAtmospheric Environment (1967), 1988