Emission Characteristics, Environmental Impacts, and Health Risks of Volatile Organic Compounds from Asphalt Materials: A State-of-the-Art Review

Energy & Fuels, Год журнала: 2024, Номер 38(6), С. 4787 - 4802

Опубликована: Фев. 29, 2024

The emission of volatile organic compounds (VOCs) from asphalt during construction processes presents substantial risks to human health and the environment. To advance sustainable transportation development, this review offers a comprehensive study methods for characterization, release characteristics, influencing factors, mechanisms, environmental impacts VOCs. At present, research has been conducted on characterization methods, component risks. findings indicate that gas chromatography–mass spectrometry is most method characterizing Asphalt VOCs mainly comprise alkanes, aromatics, aliphatic hydrocarbons. Factors including temperature, source, ultraviolet radiation can all affect characteristics Elevated VOC levels contribute photochemical production ozone fine particulate matter, exacerbating air pollution climate change. Additionally, specific VOCs, benzene polycyclic aromatic hydrocarbons, pose humans. While progress achieved in current research, challenges persist quantifying assessing their risks, implementing effective mitigation technologies. address these challenges, future should focus establishing fingerprints, quantitative evaluation criteria, material innovation, optimization processes, exposure assessment, collaborative solution implementation.

Язык: Английский

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Road Traffic Emissions Lead to Much Enhanced New Particle Formation through Increased Growth Rates

Environmental Science & Technology, Год журнала: 2024, Номер 58(24), С. 10664 - 10674

Опубликована: Июнь 8, 2024

New particle formation (NPF) is a major source of atmospheric aerosol particles, including cloud condensation nuclei (CCN), by number globally. Previous research has highlighted that NPF less frequent but more intense at roadsides compared to urban background. Here, we closely examine both background and roadside sites in Central Europe. We show the concentration oxygenated organic molecules (OOMs) greater roadside, OOMs along with sulfuric acid onto new particles sufficient explain growth sites. identify hitherto unreported traffic-related OOM contributing 29% 16% total background, respectively. Critically, this undiscovered an essential component NPF. Without their contribution rates subsequent enhancements survival, >50 nm produced would be reduced factor 21 site. Reductions hydrocarbon emissions from road traffic may thereby reduce numbers CCN counts.

Язык: Английский

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Characterization of organic vapors by a Vocus proton-transfer-reaction mass spectrometry at a mountain site in southeastern China

The Science of The Total Environment, Год журнала: 2024, Номер 919, С. 170633 - 170633

Опубликована: Фев. 9, 2024

Язык: Английский

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The search for sparse data in molecular datasets: Application of active learning to identify extremely low volatile organic compounds

Journal of Aerosol Science, Год журнала: 2024, Номер 179, С. 106375 - 106375

Опубликована: Март 30, 2024

The formation of aerosol particles in the atmosphere is driven by gas to particle conversion extremely low volatile organic compounds (ELVOC), with a particularly saturation vapor pressure (pSat). Identifying ELVOCs and their chemical structures both experimentally theoretically challenging: Measuring very pSat difficult, computing for these often large molecules computationally costly. Moreover, are underrepresented available datasets atmospheric species, which reduces value statistical models built on such data. We propose an active learning (AL) approach efficiently identify data pool species initially unknown pSat. assess performance our AL comparing it traditional machine regression methods, as well ELVOC classification based molecular properties. proves be highly efficient method identification limitations type can identify. also show that or property-based methods adequate tools depending desired degree efficiency.

Язык: Английский

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The critical role of aqueous-phase processes in aromatic-derived nitrogen-containing organic aerosol formation in cities with different energy consumption patterns

Atmospheric chemistry and physics, Год журнала: 2025, Номер 25(5), С. 2763 - 2780

Опубликована: Март 4, 2025

Abstract. Nitrogen-containing organic compounds (NOCs) impact air quality and human health. Here, the abundance, potential precursors, main formation mechanisms of NOCs in PM2.5 during winter were compared for first time among Haerbin (dependent on coal heating), Beijing (natural gas as heating energy), Hangzhou (no centralized policy). The total signal intensity CHON+, CHN+, CHON− was highest lowest Hangzhou. Anthropogenic aromatics accounted 73 %–93 % all identified precursors Haerbin. Although abundance aromatic-derived lower than Haerbin, also contributors to NOC Beijing. exhibited levels aromatic precursors. Furthermore, non-metric multidimensional scaling analysis indicated an overall reduction fossil fuel combustion pollution along route from We found that aqueous-phase processes (mainly condensation, hydrolysis, or dehydration reduced mainly oxidization hydrolysis oxidized NOCs) can promote transformation produce NOCs, leading most significant increase (particularly haze days). Reduced precursor emissions (the lowest) constrained NOCs. results suggest aerosol coal-dependent cities is controlled by anthropogenic processes. Thus, without effective emission controls, through may still pose a large threat quality.

Язык: Английский

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Oxygenated organic molecules produced by low-NO_x photooxidation of aromatic compounds: contributions to secondary organic aerosol and steric hindrance

Atmospheric chemistry and physics, Год журнала: 2024, Номер 24(4), С. 2099 - 2112

Опубликована: Фев. 19, 2024

Abstract. Oxygenated organic molecules (OOMs) produced by the oxidation of aromatic compounds are key components secondary aerosol (SOA) in urban environments. The steric effects substitutions and rings role reaction pathways altering OOM distributions remain unclear because lack systematic multi-precursor study over a wide range OH exposure. In this study, we conducted flow-tube experiments used nitrate adduct time-of-flight chemical ionization mass spectrometer (NO3--TOF-CIMS) to measure OOMs photooxidation six precursors under low-NOx conditions. For single precursors, detected peak clusters show an oxygen atom difference one or two, indicating involvement multi-step auto-oxidation alkoxy radical pathways. Multi-generation is needed explain diverse hydrogen numbers observed formulae. particular, for double-ring at higher exposure, multi-generation may have significantly enriched dimer results suggest that methyl precursor lead less fragmented products, while structure corresponds efficient formation closed-shell monomeric dimeric both highlighting significant molecular on formation. Naphthalene-derived however lower volatilities greater SOA contributions than other-type OOMs, which be more important initial particle growth. Overall, identified NO3--TOF-CIMS contributed up 30.0 % measured mass, suggesting oxygenated, undetected semi-volatile products. Our highlight roles progressive oxidation, substitution ring from need considered future model developments improve performance aerosol.

Язык: Английский

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Molecular insights into the formation of Criegee intermediates from β-hydroxyperoxy radicals

Atmospheric Environment, Год журнала: 2024, Номер unknown, С. 120828 - 120828

Опубликована: Сен. 1, 2024

Язык: Английский

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Molecular Composition of Anthropogenic Oxygenated Organic Molecules and Their Contribution to Organic Aerosol in a Coastal City

Environmental Science & Technology, Год журнала: 2023, Номер 57(42), С. 15956 - 15967

Опубликована: Окт. 16, 2023

Organic aerosols (OA) have gained attention as a substantial component of atmospheric owing to their impact on visibility, climate, and human health. Although oxygenated organic molecules (OOMs) are essential contributors OA formation, the sources, transformations, fates OOMs not fully understood. Herein, anthropogenic (AOOMs), volatile compounds (AVOCs), were concurrently measured in Xiamen, coastal city southeastern China. Our results show that AOOMs exhibited high nitrogen content (76%) low oxidation degree. Strong photochemical processes aromatic VOCs predominant sources AOOMs. Also, NOx concentrations occurrence multigeneration OH radical oxidations critical factors might influence formation Finally, newly developed aerosol dynamic model's more than 35% mass growth rate is attributed gas-particle partitioning Further sensitivity testing demonstrates contribution significantly enhanced during high-particulate-concentration periods, especially under low-temperature conditions. This study emphasizes vital role photochemically produced derived from AVOCs urban atmosphere.

Язык: Английский

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Resolving Atmospheric Oxygenated Organic Molecules in Urban Beijing Using Online Ultrahigh-Resolution Chemical Ionization Mass Spectrometry

Environmental Science & Technology, Год журнала: 2024, Номер unknown

Опубликована: Сен. 27, 2024

Gaseous oxygenated organic molecules (OOMs) are crucial precursors of atmospheric aerosols. OOMs in urban atmospheres have complex compositions, posing challenges to understanding their formation, evolution, and influences. In this study, we identify 2403 gaseous Beijing using online nitrate-based chemical ionization Orbitrap mass spectrometry based on one-year measurements. We find that can be identified with higher accuracy wider coverage, compared previously used spectrometry. With optimized OOM resolving capabilities, previous knowledge expanded. First, clear homologous oxygen-addition characteristics the revealed. Second, lower concentrations or masses characterized high confidence, e.g., above 350 Da. particular, dimers (e.g., C

Язык: Английский

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New mechanism for the participation of aromatic oxidation products in atmospheric nucleation

The Science of The Total Environment, Год журнала: 2024, Номер 917, С. 170487 - 170487

Опубликована: Янв. 29, 2024

Язык: Английский

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