Impact of Meteorology and Aerosol Sources on PM2.5 and Oxidative Potential Variability and Levels in China DOI Creative Commons
Jiemei Liu, Jesper H. Christensen, Zhuyun Ye

и другие.

Опубликована: Дек. 7, 2023

Abstract. China has long-term high PM2.5 levels, and its Oxidative Potential (OP) is worth studying as it may unravel the impacts of aerosol pollution on public health better than alone. OP are influenced by meteorological factors, anthropogenic emissions sources atmospheric aging. Although their impact have been studied, measurements only recently became available a limited scale, they require considerable technical expertise resources. For this, joint relationship between for wide range conditions profiles remain elusive. Towards we estimated over using Danish Eulerian Hemispheric Model (DEHM) system with input from WRF weather forecast model. It was found that higher values were primarily concentrated in urban agglomerations central eastern regions China, while lower western northeastern regions. Furthermore, probability density function revealed about 40 % areas had an annual average concentrations exceeding Chinese limit; 36 below 1 𝑛𝑚𝑜𝑙 𝑚𝑖𝑛−1 𝑚−3, 41 2 23 above 𝑚−3. Analysis simulations indicate emission contributed 46 (65 %) 54 (35 to concentration variability. The sensitivity analysis also highlighted levels mostly determined secondary formation biomass burning.

Язык: Английский

Impacts of Portable Air Purifiers on the Oxidative Potential and Sources of Organic Matter in Indoor PM2.5 DOI Creative Commons
Yixiang Wang, James J. Schauer,

Yinping Zhang

и другие.

ACS ES&T Air, Год журнала: 2024, Номер 1(11), С. 1453 - 1462

Опубликована: Окт. 16, 2024

Organic matter (OM) is a major contributor to the oxidative potential (OP) of indoor PM2.5. Portable air purifiers equipped with high-efficiency particulate (HEPA) filters are known effectively remove PM2.5 mass concentrations. However, their impacts on OP and sources OM whether these could further affect metals remain poorly understood. In crossover trial, each 43 asthmatic children underwent 2-week true filtration (HEPA + activated carbon [AC]) sham (no HEPA no AC), randomized order. samples, simultaneously collected in participants' bedrooms outside homes, were measured for concentration, composition, mass-normalized (OPm, per mass), volume-normalized (OPv, OPm × concentration). Compared filtration, was 34% lower, 70% OPv 80% lower during filtration. The reduction largely attributed removing more reactive outdoor secondary OM. change composition also contributed reduced metals' OPm. Our results suggest that AC efficiently reduce by

Язык: Английский

Процитировано

0
Key drivers and source mechanisms of oxidative potential in fine particles from an industrial city of Northern China Plain DOI

Zhao Ronghua,

Jian Wang,

Zeyu Gao

и другие.

The Science of The Total Environment, Год журнала: 2024, Номер 959, С. 178171 - 178171

Опубликована: Дек. 26, 2024

Язык: Английский

Процитировано

0
Effects of Photo-Oxidation and Transition Metals on the Formation of Reactive Oxygen Species from Aromatic Compounds Using Spectroscopic Method DOI
Xiao‐Yu Hu, Juanjuan Qin, Yuanyuan Qin

и другие.

Опубликована: Янв. 1, 2023

Reactive Oxygen Species (ROS) from particulate matter (PM) can cause adverse health effects. Although the ROS-inducing capability of PM depends on its composition and environmental factors, most research has focused impact component interactions. The role photo-oxidation often been overshadowed. This study investigates effects ROS production aromatic compounds (ACs, including catechol (CAT), phthalic acid (PA), 4,4’-oxydibenzoic (4,4’-OBA)) in PM. Moreover, influence interactions between ACs transition metals (TMs, Fe(II), Mn(II), Cu(II)), are concurrently taken into account. results showed facilitated generation ACs. Combined Fourier-transform infrared attenuated total-reflectance spectroscopy (FTIR-ATR) Ultraviolet-visible (UV-vis) caused variations relative intensity chemical bonds, breakage formation an increase light absorption. For ACs-TMs generations, CAT-Fe(II)/Cu(II) synergistic effects; ACs-Mn(II) PA-Fe(II)/Cu(II) exhibited first then antagonistic 4,4’-OBA-Fe(II)/Cu(II) UV-vis different interaction were due to complexation. photo-oxidized significantly enhanced compared with ACs-TMs. corresponding absorbance functional groups. suggested mechanism involves that π-electrons benzene ring groups transfer ground state excited state, leading bonds TMs more easily. Our work among components influenced generation, atmospheric oxidative conditions, such as photo-oxidation, played a significant role. Further studies should integrate broader factors for comprehensive assessment potential

Язык: Английский

Процитировано

0
Impact of Meteorology and Aerosol Sources on PM2.5 and Oxidative Potential Variability and Levels in China DOI Creative Commons
Jiemei Liu, Jesper H. Christensen, Zhuyun Ye

и другие.

Опубликована: Дек. 7, 2023

Abstract. China has long-term high PM2.5 levels, and its Oxidative Potential (OP) is worth studying as it may unravel the impacts of aerosol pollution on public health better than alone. OP are influenced by meteorological factors, anthropogenic emissions sources atmospheric aging. Although their impact have been studied, measurements only recently became available a limited scale, they require considerable technical expertise resources. For this, joint relationship between for wide range conditions profiles remain elusive. Towards we estimated over using Danish Eulerian Hemispheric Model (DEHM) system with input from WRF weather forecast model. It was found that higher values were primarily concentrated in urban agglomerations central eastern regions China, while lower western northeastern regions. Furthermore, probability density function revealed about 40 % areas had an annual average concentrations exceeding Chinese limit; 36 below 1 𝑛𝑚𝑜𝑙 𝑚𝑖𝑛−1 𝑚−3, 41 2 23 above 𝑚−3. Analysis simulations indicate emission contributed 46 (65 %) 54 (35 to concentration variability. The sensitivity analysis also highlighted levels mostly determined secondary formation biomass burning.

Язык: Английский

Процитировано

0