Prediction of developmental toxic effects of fine particulate matter (PM2.5) water-soluble components via machine learning through observation of PM2.5 from diverse urban areas

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 946, P. 174027 - 174027

Published: June 19, 2024

The global health implications of fine particulate matter (PM

Language: Английский

---

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

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 949, P. 175045 - 175045

Published: July 26, 2024

Language: Английский

---

Oligomerization Mechanism of Methylglyoxal Regulated by the Methyl Groups in Reduced Nitrogen Species: Implications for Brown Carbon Formation

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(3), P. 1563 - 1576

Published: Jan. 6, 2024

Uncertain chemical mechanisms leading to brown carbon (BrC) formation affect the drivers of radiative effects aerosols in current climate predictions. Herein, aqueous-phase reactions methylglyoxal (MG) and typical reduced nitrogen species (RNSs) are systematically investigated by using combined quantum calculations laboratory experiments. Imines diimines identified from mixtures methylamine (MA) ammonia (AM) with MG, but not dimethylamine (DA) MG mixture under acidic conditions, because deprotonation DA cationic intermediates is hindered amino groups occupied two methyl groups. It leads N-heterocycle (NHC) + MA (MGM) AM (MGA) reaction systems N-containing chain oligomer (MGD) system. Distinct product attributed electrostatic attraction steric hindrance, which regulated RNSs. The light absorption adverse NHCs also strongly related Our finding reveals that BrC mainly contributed RNSs less groups, have more abundant broad sources urban environments.

Language: Английский

---

Catalysis of Ferric Ions and Ferrous Ions on the Reaction of Methylglyoxal and Ammonium Sulfate

ACS Earth and Space Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 3, 2025

Secondary brown carbon is an important component of the atmosphere. The contribution secondary atmospheric from reaction methylglyoxal (MG) with ammonium sulfate (AS) has been demonstrated in laboratory. However, mechanism still unclear, especially influenced by other factors, for example, inorganic salt. In this study, effect soluble iron salt on between MG and AS was investigated through chemical analysis methods, including optical molecular probes. results indicate that ferrous may promote MG–AS accelerate formation carbon. Ferrous exhibits a higher catalytic activity than ferric does. Moreover, indicates Fe(II) true catalyst, rate constant 13 times uncatalyzed reaction, while Fe(III) due to its reduction MG. addition, complex aqueous phase identified.

Language: Английский

---

Synergistic Toxicity of Fine Particulate Matter and Ozone and Their Underlying Mechanisms

Toxics, Journal Year: 2025, Volume and Issue: 13(4), P. 236 - 236

Published: March 24, 2025

The co-occurrence of fine particulate matter (PM2.5) and ozone has emerged as a critical environmental challenge in recent years. individual harmful impacts PM2.5 exposure have been well studied; however, their combined toxicity under co-exposure conditions remains mechanistically undefined. This paper provides an extensive evaluation the current pollution levels, epidemiological investigation, new findings on toxicological mechanisms to ozone. synergistic depends different factors, including physicochemical properties PM2.5, dose duration exposure, specific target organs. Through research, we identified main targets toxic responses summarized mechanisms. Given research priorities, there is urgent need improve scientific regarding with priority given characterizing while updating relevant guidelines standards.

Language: Английский

---

Size-Segregated Chemical Composition and Oxidative Potential of Ambient Ultrafine and Accumulation Mode Particles in Los Angeles

Published: Jan. 1, 2025

Language: Английский

---

Ambient ammonium exposure is associated with physical dysfunction in older adults in China

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: May 31, 2025

Language: Английский

---

PM_2.5 Constituents and Hospitalizations of a Wide Spectrum of Respiratory Diseases: A Nationwide Case-Crossover Study in China

Environment & Health, Journal Year: 2025, Volume and Issue: unknown

Published: June 4, 2025

Language: Английский

---

Pollutants, including Organophosphorus and Organochloride Pesticides, May Increase the Risk of Cardiac Remodeling and Atrial Fibrillation: A Narrative Review

Biomedicines, Journal Year: 2023, Volume and Issue: 11(9), P. 2427 - 2427

Published: Aug. 30, 2023

Atrial fibrillation (AF) is the most common type of cardiac rhythm disorder. Recent clinical and experimental studies reveal that environmental pollutants, including organophosphorus-organochloride pesticides air pollution, may contribute to development arrhythmias AF. Here, we discussed unifying cascade events explain role pollutant exposure in Following ingestion inhalation pollution-promoting toxic compounds, damage-associated molecular pattern (DAMP) stimuli activate inflammatory response oxidative stress negatively affect respiratory, cognitive, digestive, systems. Although detailed mechanisms underlying association between incidence AF are not completely elucidated, some reports fundamental research data support idea poisoning can provoke perturbed ion channel function, myocardial electrical abnormalities, decreased action potential duration, slowed conduction, contractile dysfunction, fibrosis,

Language: Английский

---

Origins of the seasonal variability of PM2.5 sources in a rural site in Northern France

Atmospheric Environment, Journal Year: 2024, Volume and Issue: 333, P. 120660 - 120660

Published: June 15, 2024

Air quality in rural areas results from the crossing of aged air masses transported urban with local emissions dominated by agriculture and vegetation. The result is a complex mixture primary secondary atmospheric species, coming varied sources geographical areas. We implemented methodology for deconvoluting determining origins main aerosol impacting typical area northern France. A one-year field campaign was conducted site located between Paris Brussels March 2018 to February 2019. Hourly-based observations inorganic organic precursor gases PM2.5 speciation were collected using on-line instrumentation. annual concentrations 12.2 ± 9.23 μg m−3 explained four extracted through positive matrix factorization analyses: combustion (40.2%), NO3-rich (26.8%), SO4-rich (18%) mixed marine (15%). SIA-rich drive 85 % yearly mass variability. factor most prominent during winter (53.3% mass) due high contributions regional transport biomass burning pollutants (winter OC/EC = 6.0; OC-to-OM 2.05). In summer, it likely driven production agricultural waste events (summer 8.6; 1.85). Comparing other sites, we observed strong background carbonaceous particles regardless typology. SIA fraction source compared source. spring, dominate (36.9%) intense activity. temporal variability processes Benelux North-to-South gradient decreasing concentrations. minor proportion NH4NO3 seems be effects morning dew photochemical oxidation NO2 afternoon. HNO3 appears limiting formation. toxicity low population densities should not only addressed based on concentration, but also considering chemical composition as people environments are exposed aerosols triggered NH3 excess.

Language: Английский

---