Secondary Organic Aerosol Generated from Biomass Burning Emitted Phenolic Compounds: Oxidative Potential, Reactive Oxygen Species, and Cytotoxicity

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(19), P. 8194 - 8206

Published: April 29, 2024

Phenolic compounds are largely emitted from biomass burning (BB) and have a significant potential to form SOA (Phc-SOA). However, the toxicological properties of Phc-SOA remain unclear. In this study, phenol guaiacol were chosen as two representative phenolic gases in BB plumes, water-soluble components their generated under different photochemical ages NOx levels investigated. contribute greatly oxidative (OP) biomass-burning SOA. OH-adducts (e.g., 2-methoxyhydroquinone) identified (GSOA) with high OP. The addition nitro groups 2,5-dimethyl-1,4-benzoquinone, surrogate quinone compound Phc-SOA, increased its toxicity both (PSOA) GSOA vitro human alveolar epithelial cells decreased aging terms cell death cellular reactive oxygen species (ROS), possibly due more ring-opening products relatively low toxicity. influence was consistent between ROS for but not PSOA, indicating that production does necessarily represent all processes contributing caused by PSOA. Combining acellular assays can provide comprehensive understanding aerosol properties.

Language: Английский

Anthropogenic Extremely Low Volatility Organics (ELVOCs) Govern the Growth of Molecular Clusters Over the Southern Great Plains During the Springtime

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(21)

Published: Oct. 29, 2024

Abstract New particle formation (NPF) often drives cloud condensation nuclei concentrations and the processes governing nucleation of molecular clusters vary substantially in different regions. The growth these from ∼2 to >10 nm diameters is driven by availability extremely low volatility organic vapors (ELVOCs). Although pathways ELVOC oxidation biogenic terpenes are better understood, mechanistic for anthropogenic organics less well understood. We integrate measurements detailed regional model simulations understand NPF secondary aerosol at Southern Great Plain (SGP) observatory Oklahoma compare with a site within Bankhead National Forest (BNF) Alabama, southeast USA. During our two simulated event days, rates predicted be least an order magnitude higher SGP compared BNF largely due lower sulfuric acid (H 2 SO 4 ) BNF. Among mechanisms WRF‐Chem, we find that dimethylamine (DMA) + H mechanism dominates SGP. ELVOCs critical explaining particles observed Treating as semisolid, strong diffusion limitations vapor uptake phase, brings predictions into closer agreement observations. also simulate non‐NPF days show low‐level clouds reduce photochemical activity corresponding reductions concentrations, thereby lack NPF.

Language: Английский

Microscopic Characterization of Individual Aerosol Particles in a Typical Industrial City and Its Surrounding Rural Areas in China

Toxics, Journal Year: 2024, Volume and Issue: 12(7), P. 525 - 525

Published: July 22, 2024

Transmission electron microscopy was used to analyze individual aerosol particles collected in Lanzhou (urban site) and its surrounding areas (rural early 2023. The results revealed that from the pre-Spring Festival period Spring period, main pollutants at urban site decreased significantly, while PM

Language: Английский