Details

Autor(en) / Beteiligte

• Brito, Joel
• Carbone, Samara
• A. Monteiro dos Santos, Djacinto
• Dominutti, Pamela
• de Oliveira Alves, Nilmara
• V. Rizzo, Luciana
• Artaxo, Paulo

Titel

Disentangling vehicular emission impact on urban air pollution using ethanol as a tracer

Ist Teil von

• Scientific reports, 2018-07, Vol.8 (1), p.10679-10, Article 10679

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2018

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• The Sao Paulo Metropolitan Area is a unique case worldwide due to the extensive use of biofuel, particularly ethanol, by its large fleet of nearly 8 million cars. Based on source apportionment analysis of Organic Aerosols in downtown Sao Paulo, and using ethanol as tracer of passenger vehicles, we have identified primary emissions from light-duty-vehicles (LDV) and heavy-duty-vehicles (HDV), as well as secondary process component. Each of those factors mirror a relevant primary source or secondary process in this densely occupied area. Using those factors as predictors in a multiple linear regression analysis of a wide range of pollutants, we have quantified the role of primary LDV or HDV emissions, as well as atmospheric secondary processes, on air quality degradation. Results show a significant contribution of HDV emissions, despite contributing only about 5% of vehicles number in the region. The latter is responsible, for example, of 40% and 47% of benzene and black carbon atmospheric concentration, respectively. This work describes an innovative use of biofuel as a tracer of passenger vehicle emissions, allowing to better understand the role of vehicular sources on air quality degradation in one of most populated megacities worldwide.