Abstract：
:Carbonaceous particulate matter (PM), comprising black carbon (BC), primary organic aerosol (POA) and secondary organic aerosol (SOA, from atmospheric aging of precursors), is a highly toxic vehicle exhaust component. Therefore, understanding vehicle pollution requires knowledge of both primary emissions, and how these emissions age in the atmosphere. We provide a systematic examination of carbonaceous PM emissions and parameterisation of SOA formation from modern diesel and gasoline cars at different temperatures (22, -7 °C) during controlled laboratory experiments. Carbonaceous PM emission and SOA formation is markedly higher from gasoline than diesel particle filter (DPF) and catalyst-equipped diesel cars, more so at -7 °C, contrasting with nitrogen oxides (NOX). Higher SOA formation from gasoline cars and primary emission reductions for diesels implies gasoline cars will increasingly dominate vehicular total carbonaceous PM, though older non-DPF-equipped diesels will continue to dominate the primary fraction for some time. Supported by state-of-the-art source apportionment of ambient fossil fuel derived PM, our results show that whether gasoline or diesel cars are more polluting depends on the pollutant in question, i.e. that diesel cars are not necessarily worse polluters than gasoline cars.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Platt SM,El Haddad I,Pieber SM,Zardini AA,Suarez-Bertoa R,Clairotte M,Daellenbach KR,Huang RJ,Slowik JG,Hellebust S,Temime-Roussel B,Marchand N,de Gouw J,Jimenez JL,Hayes PL,Robinson AL,Baltensperger U,Astorga C,Prévôdoi
10.1038/s41598-017-03714-9subject
Has Abstractpub_date
2017-07-13 00:00:00pages
4926issue
1issn
2045-2322pii
10.1038/s41598-017-03714-9journal_volume
7pub_type
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