Primary and Secondary Organic Aerosol Formation from Asphalt Pavements

Humes, Mackenzie B.; Machesky, Jo E.; Kim, Sunhye; Oladeji, Oladayo J.; Gentner, Drew R.; Donahue, Neil M.; Presto, Albert A.

doi:10.1021/acs.est.3c06037

Cited by 1 publication

(3 citation statements)

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“…Large aromatics and IVOCs emissions from asphalt materials have been found in the laboratory study . Also, Humes et al flushed the emitted vapors from asphalt samples into an oxidation chamber, and significant SOA formation was observed …”

Section: Introductionmentioning

confidence: 61%

“…Recently, a few research suggested that asphalt-related emissions are an important source of atmospheric hydrocarbons as well as SOA precursors. , Based on the chemical profile reported in a previous study, a significant character of asphalt-related emissions is lower levels of the VOCs species below C 10 and higher levels of IVOCs . Among IVOCs, C 11 –C 16 straight-chain, branched-chain, monocyclic, and bicyclic alkanes (SBMB 11–16 ) account for more than 90% of the mass loading.…”

Section: Discussionmentioning

confidence: 99%

“…21 Also, Humes et al flushed the emitted vapors from asphalt samples into an oxidation chamber, and significant SOA formation was observed. 22 Tire emissions have recently drawn many studies, mainly focusing on particle emissions. 23 Actually, gas-phase organic vapors can also be emitted from vehicular tires into the atmosphere.…”

Section: T H Imentioning

confidence: 99%

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Secondary Organic Aerosol Formation Potential from Vehicular Non-tailpipe Emissions under Real-World Driving Conditions

Zhang,

Peng,

Song

et al. 2024

Environ. Sci. Technol.

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Traffic emissions are a dominant source of secondary organic aerosol (SOA) in urban environments. Though tailpipe exhaust has drawn extensive attention, the impact of non-tailpipe emissions on atmospheric SOA has not been well studied. Here, a closure study was performed combining urban tunnel experiments and dynamometer tests using an oxidation flow reactor in situ photo-oxidation. Results show a significant gap between field and laboratory research; the average SOA formation potential from real-world fleet is 639 ± 156 mg kg fuel −1 , higher than the reconstructed result (188 mg kg fuel −1 ) based on dynamometer tests coupled with fleet composition inside the tunnel. Considering the minimal variation of SOA/CO in emission standards, we also reconstruct CO and find the critical role of high-emitting events in the real-world SOA burden. Different profiles of organic gases are detected inside the tunnel than tailpipe exhaust, such as more abundant C 6 −C 9 aromatics, C 11 −C 16 species, and benzothiazoles, denoting contributions from non-tailpipe emissions to SOA formation. Using these surrogate chemical compounds, we roughly estimate that high-emitting, evaporative emission, and asphalt-related and tire sublimation share 14, 20, and 10% of the SOA budget, respectively, partially explaining the gap between field and laboratory research. These experimental results highlight the importance of non-tailpipe emissions to atmospheric SOA.

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Section: Introductionmentioning

confidence: 61%