Does income inequality reshape the environmental Kuznets curve (EKC) hypothesis? A nonlinear panel data analysis

Environmental Research, Год журнала: 2022, Номер 216, С. 114575 - 114575

Опубликована: Окт. 14, 2022

Язык: Английский

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Secondary Formation of Submicron and Supermicron Organic and Inorganic Aerosols in a Highly Polluted Urban Area

Journal of Geophysical Research Atmospheres, Год журнала: 2023, Номер 128(4)

Опубликована: Фев. 16, 2023

Abstract Different adverse health effects of submicron (PM 1 ) and fine particles 2.5 may be attributed to their chemical differences, requiring a better understanding size‐resolved composition. Herein, extensive online measurements were conducted across seasons in Beijing by two aerosol mass spectrometers, one which alternately sampled PM . Source apportionment organic (OA) indicated that traffic‐ cooking‐related OA together accounted for ∼20%−30% the , showing insignificant seasonal variations. Coal‐combustion biomass‐burning‐related had minor contributions. The secondary (SOA) factors 59%−73% distributions particulate components varied greatly seasons. Secondary formation played key role particle size growth during cold During severe hazes with high liquid water content (ALWC), supermicron fraction (MF 1−2.5 reached ∼40%−50% while those primary remained at ∼20%. Heterogeneous uptake, aqueous processing, dissolution likely all contributed enhanced concentration components, former perhaps more important. increase MF increasing ALWC spring was less than winter, possibly due shorter duration stagnant conditions limiting formation. Early autumn showed higher values changes as varied, plausibly explained intensive new hindering persistent growth. Our results highlight importance heterogeneous uptake processing distributing SOA mode polluted areas.

Язык: Английский

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Atmospheric nanoparticle growth

Reviews of Modern Physics, Год журнала: 2023, Номер 95(4)

Опубликована: Ноя. 9, 2023

Atmospheric nanoparticles can serve as nuclei for cloud droplets, thereby inducing significant but uncertain effects on the radiative forcing of climate system. This article focuses physicochemical processes that govern growth these particles from formation molecular clusters until reach sizes where they act condensation nuclei. The review describes latest developments in measurement and modeling connects domains to large-scale simulations such Earth system models. authors recommend closer coordination among laboratory studies, atmospheric measurements, understand importance

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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Advances in analysis of atmospheric ultrafine particles and application in air quality, climate, and health research

The Science of The Total Environment, Год журнала: 2024, Номер 949, С. 175045 - 175045

Опубликована: Июль 26, 2024

Язык: Английский

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Effects of volatile organic compounds and new particle formation on real-time hygroscopicity of PM2.5 particles in Seosan, Republic of Korea

The Science of The Total Environment, Год журнала: 2024, Номер 924, С. 171516 - 171516

Опубликована: Март 7, 2024

Язык: Английский

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New Insights on the Formation of Nucleation Mode Particles in a Coastal City Based on a Machine Learning Approach

Environmental Science & Technology, Год журнала: 2023, Номер 58(2), С. 1187 - 1198

Опубликована: Дек. 20, 2023

Atmospheric particles have profound implications for the global climate and human health. Among them, ultrafine dominate in terms of number concentration exhibit enhanced toxic effects as a result their large total surface area. Therefore, understanding driving factors behind particle behavior is crucial. Machine learning (ML) provides promising approach handling complex relationships. In this study, three ML models were constructed on basis field observations to simulate nucleation mode (PNCN). All exhibited robust PNCN reproduction (R2 > 0.80), with random forest (RF) model excelling test data = 0.89). Multiple methods feature importance analysis revealed that ultraviolet (UV), H2SO4, low-volatility oxygenated organic molecules (LOOMs), temperature, O3 primary influencing PNCN. Bivariate partial dependency plots (PDPs) indicated during nighttime overcast conditions, presence H2SO4 LOOMs may play crucial role Additionally, integrating additional detailed information related emissions or meteorology would further enhance performance. This pilot study shows can be novel simulating atmospheric pollutants contributes better formation growth mechanisms particles.

Язык: Английский

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Fostering a Holistic Understanding of the Full Volatility Spectrum of Organic Compounds from Benzene Series Precursors through Mechanistic Modeling

Environmental Science & Technology, Год журнала: 2024, Номер 58(19), С. 8380 - 8392

Опубликована: Май 1, 2024

A comprehensive understanding of the full volatility spectrum organic oxidation products from benzene series precursors is important to quantify air quality and climate effects secondary aerosol (SOA) new particle formation (NPF). However, current models fail capture due absence reaction pathways. Here, we develop a novel unified model framework, integrated two-dimensional basis set (I2D-VBS), simulate by simultaneously representing first-generational oxidation, multigenerational aging, autoxidation, dimerization, nitrate formation, etc. The successfully reproduces O/C distributions oxygenated molecules (OOMs) as well concentrations SOA over wide-ranging experimental conditions. In typical urban environments, autoxidation are two main pathways for OOMs with similar contributions, but contributes more low-volatility products. NOx can reduce about two-thirds SOA, most extremely compared clean conditions, suppressing dimerization autoxidation. I2D-VBS facilitates holistic product which helps fill large gap in predictions NPF, growth, formation.

Язык: Английский

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Direct calibration using atmospheric particles and performance evaluation of Particle Size Magnifier (PSM) 2.0 for sub-10 nm particle measurements

Atmospheric measurement techniques, Год журнала: 2025, Номер 18(2), С. 431 - 442

Опубликована: Янв. 27, 2025

Abstract. The Particle Size Magnifier is widely used for measuring nano-sized particles. Here we calibrated the newly developed version 2.0 (PSM 2.0). We 1–10 nm particles with different compositions, including metal particles, organic generated in laboratory, and atmospheric collected Helsinki Hyytiälä. A noticeable difference among calibration curves was observed. Atmospheric from Hyytiälä required higher diethylene glycol (DEG) supersaturation to be activated compared (standard particles) other types of This suggests that chemical composition differences introduce measurement uncertainties highlights importance situ calibration. size resolution PSM characterized using maximum observed at 2–3 nm. then operated ambient particle measurements parallel a Half Mini differential mobility sizer (DMPS). During new formation (NPF) events, comparable total concentrations were between DMPS based on Meanwhile, applying caused an overestimation 3–10 In terms distributions, similar patterns when summary, powerful instrument sub-10 can achieve more precise distribution proper

Язык: Английский

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Incomplete mass closure in atmospheric nanoparticle growth

npj Climate and Atmospheric Science, Год журнала: 2025, Номер 8(1)

Опубликована: Фев. 26, 2025

Язык: Английский

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