Key drivers of the oxidative potential of PM2.5 in Beijing in the context of air quality improvement from 2018 to 2022

Environment International, Год журнала: 2024, Номер 187, С. 108724 - 108724

Опубликована: Май 1, 2024

The mass concentration of atmospheric particulate matter (PM) has been continuously decreasing in the Beijing-Tianjin-Hebei region. However, health endpoints do not exhibit a linear correlation with PM concentrations. Thus, it is urgent to clarify prior toxicological components further improve air quality. In this study, we analyzed long-term oxidative potential (OP) water-soluble PM2.5, which generally considered more effective assessing hazardous exposure Beijing from 2018 2022 based on dithiothreitol assay and identified crucial drivers OP PM2.5 online monitoring pollutants, receptor model, random forest (RF) model. Our results indicate that dust, traffic, biomass combustion are main sources Beijing. complex interactions dust particles, black carbon, gaseous pollutants (nitrogen dioxide sulfur dioxide) factors driving evolution, particular, leading abnormal rise 2022. data shows higher observed winter spring compared summer autumn. diurnal variation characterized by declining trend 0:00 14:00 an increasing 23:00. spatial was as lower than Shijiazhuang, while Zhenjiang Haikou, primarily influenced distribution carbon. significance identifying key influencing provide new insights for advancing quality improvement efforts focus safeguarding human

Язык: Английский

---

Incomplete solid fuel burning as the major emission source of atmospheric phenols and environmentally persistent free radicals

Fuel, Год журнала: 2024, Номер 369, С. 131735 - 131735

Опубликована: Апрель 21, 2024

Язык: Английский

---

Seasonal Variations and Health Risk Evaluation of Trace Elements in Atmospheric PM2.5 in Liaocheng, the North China Plain

Atmosphere, Год журнала: 2025, Номер 16(1), С. 72 - 72

Опубликована: Янв. 9, 2025

Atmospheric elements can cause harmful effects on air quality and human health. Despite extensive research PM2.5, there remains a limited understanding of the seasonal variations, origins, associated health risks specific in urban areas North China Plain. PM2.5 samples across four seasons were collected to investigate provenance, 18 Liaocheng. The concentrations total detected (TDEs) exhibited distinct patterns, with biggest values occurring winter, followed by spring, autumn, summer. Fe, Ca, Al, K most plentiful throughout campaign, contributing 72.2% TDEs. enhanced crustal due frequent dust storms spring. Results from positive matrix factorization suggested that source was only identified accounting for largest percentage (37.0%), while secondary oxidation made significant contribution (34.6%) summer, facilitated higher temperatures stronger sunshine. relative abundance (41.6%) biomass burning highest ascribed intensified agricultural waste during autumn harvest, especially October. coal combustion cold substantially greater than warm seasons, highlighting role increased house heating deteriorating quality. Potential function analysis showed Liaocheng originated local neighboring regions. carcinogenic risk selected notably adult males females children, non-carcinogenic children adults. Overall, these findings provide ponderable insights into contamination characteristics sources elements, which are useful inform effective measures improving aerosol modeling.

Язык: Английский

---

Socioeconomic Inequalities in PM_2.5 Exposure and Local Source Contributions at Community Scales Using Hyper-Localized Taxi-Based Mobile Monitoring in Xi’an, China

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Март 12, 2025

The relationship between the socioeconomic status (SES) and PM2.5 exposure is rather inconclusive. We employed taxi-based measurements with 30 m resolution to characterize local source contribution (PM2.5 adjusted concentration) discerned for 2019 winter 2020 summer, in Xi'an. A big data set comprising ∼6 × 106 hourly SES from ∼5000 communities was utilized examine inequalities community-level exposure. Our results indicate that inhabitants lower are more likely be disproportionately exposed compared those higher SES. At least 92% of rural regions reside low areas, whereas a relatively smaller proportion (69–78%) urban regions. has profound impact on during summer than winter. polluted areas concentration accounted 22% 26% total However, residing low-concentration contributed only 12% while 30%. These findings provide valuable insights into SES, highlighting need sophisticated air quality policies alleviate

Язык: Английский

---

Molecular signatures and formation mechanisms of water-soluble chromophores in particulate matter from Karachi in Pakistan

The Science of The Total Environment, Год журнала: 2024, Номер 914, С. 169890 - 169890

Опубликована: Янв. 6, 2024

Язык: Английский

---

Environmentally persistent free radicals from residential raw coal combustion and association with chemical components

Emerging contaminants, Год журнала: 2024, Номер 10(4), С. 100346 - 100346

Опубликована: Апрель 25, 2024

Emerging environmental persistent free radicals (EPFRs), can generate reactive oxygen species (ROS), posing potential exposure risks to human health. Incomplete coal combustion is a major source of EPFRs. Organic carbonaceous fractions are essential and important players in the formation EPFRs during combustion. However, relationship between individual organic non-carbon with such emissions not well known. This paper investigated characteristics discharged from simulated Our results showed that concentration was concentrated on PM1.1 (51.66–81.85 %), more easily oxidized by resulting producing oxygen-centered (semiquinone-type) PM1.1. The mean line width (ΔHp-p) 5.87 ± 0.41G higher than biomass combustion, indicating radical were emitted Humic-like substances-carbon (HULIS-C) contributor facilitate generated Secondary processes have also contributed result noted there no transition metals EPFRs, may be due variability complexity chemical properties composition PM. critical for prediction geochemical behavior risk assessment which provide basic data support policy development address rural air pollutant emissions.

Язык: Английский

---

Seasonal variations and sources of atmospheric EPFRs in a megacity in severe cold region: Implications for the influence of strong coal and biomass combustion

Environmental Research, Год журнала: 2024, Номер 252, С. 119067 - 119067

Опубликована: Май 3, 2024

Язык: Английский

---

Investigation of the Mechanism of Oxidative Potential Increase in Atmospheric Particulate Matter during Photoaging: Important Role of Aromatic Nitrogenous Compounds

Environmental Science & Technology, Год журнала: 2024, Номер 58(44), С. 19818 - 19831

Опубликована: Окт. 22, 2024

Particulate matter (PM) undergoing various aging processes in the atmosphere changes its toxicity. However, mechanism of toxicity evolution is not fully clarified currently. This study demonstrates that photoaging promotes an increase oxidative potential (OP) atmospheric PM by about 30%, and increased OP mainly attributed to production secondary organic compounds, while water-soluble metal ions contribute only 11%. The nonextractable matters (NEMs) was mostly after photoaging, followed (WSMs). NEM can produce quinone-like functional groups persistent free radicals during which are most likely reactive oxygen species (ROS). For WSM, conversion low-oxidation humic-like substances (HULIS) high-oxidation HULIS main reason for OP. Quinones, nitrophenols, N-containing heterocycles contributors produced process. Among them, quinones oxidizing active nitro-phenolic compounds heterocyclic may play a catalyst-like role, facilitating ROS newly converted HULIS. clarifies generation provides new insights into uncertainty aging.

Язык: Английский

---

Development of multi-generation lower respiratory tract model and insights into the transport and deposition characteristics of inhalable particles

The Science of The Total Environment, Год журнала: 2023, Номер 904, С. 166725 - 166725

Опубликована: Авг. 31, 2023

Язык: Английский

---

Measurement report: Impact of emission control measures on environmental persistent free radicals and reactive oxygen species – A short-term case study in Beijing

Опубликована: Янв. 2, 2024

Abstract. A series of emission control measures implemented by the Chinese government have effectively reduced air pollution multiple pollutants in many regions country recent decades. However, impacts these on environmental persistent free radicals (EPFRs) and reactive oxygen species (ROS), two groups chemical that are known to be linked with adverse human health effects, still not clear. In this study, we investigated levels, patterns, sources EPFRs gas- particle-phase ROS (referred as G-ROS P-ROS, respectively) Beijing during 2015 China Victory Day Parade period when short-term quality were imposed. The strict ambient EPFRs, G-ROS, P-ROS 18.3 %, 24.1 46.9 respectively. non-control (NCP) tended centered a mixture carbon oxygen, while those (CP) mainly oxygen-centered radicals. contribution atmospheric oxidizing capacity increased and/or decreased CP compared NCP. “Parade Blue” days largely attributed dramatic reduction secondary aerosols, which also responsible for reductions. Our findings demonstrate how effective reducing provide insights into correlations, sources, formation processes ROS.

Язык: Английский

---