Quantifying the impacts of PM2.5 constituents and relative humidity on visibility impairment in a suburban area of eastern Asia using long-term in-situ measurements

Ting, Yu-Chieh; Young, Li-Hao; Lin, Tang-Huang; Tsay, Si‐Chee; Chang, Kang‐Tsung; Hsiao, Ta-Chih

doi:10.1016/j.scitotenv.2021.151759

Cited by 28 publications

(7 citation statements)

References 82 publications

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“…PM, especially PM 2.5 , can significantly affect ecosystems, climate, and human health (Peng et al, 2016;Wang et al, 2016;Bhattarai et al, 2020). In Asia, PM 2.5 pollution has become a serious environmental issue over the past few decades (Pörtner et al, 2019;Ting et al, 2022). Numerous field measurements have shown that PM 2.5 mainly comprises organic materials and inorganic salts (Jimenez et al, 2009; and are often internally mixed in PM 2.5 in various environments (Vester et al, 2007;Ye et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Microscopic observation of a liquid-liquid-(semi)solid phase in polluted PM2.5

Gaikwad

Jeong²,

Kim³

et al. 2022

Front. Environ. Sci.

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Atmospheric aerosol particles are complex mixtures having various physicochemical properties. To predict the role and characteristics of such complex aerosol particles in air pollution and related atmospheric chemistry, our knowledge of the number and types of phases in complex aerosol particles should be improved. However, most studies on the phase behavior of aerosol particles have been conducted in the laboratory and have not used real-world aerosol particles. In this study, using a combination of optical microscopy and poke-and-flow technique, we investigated the number and types of phases of actual aerosol particles of particulate matter < 2.5 µm (PM2.5) collected on heavily polluted days in Seosan, South Korea in winter 2020–2021. From the microscopic observations at 293 K, it showed that the PM2.5 particles exist in a single liquid phase at relative humidity (RH) >∼85%, a liquid-liquid phase at ∼70% < RH <∼85%, a liquid-liquid-(semi)solid phase at ∼30% < RH <∼70%, and a (semi)solid phase at RH <∼30% upon dehydration. This reveals that three phases of atmospheric aerosol particles coexisting as liquid-liquid and liquid-liquid-(semi)solid would be the most common phases in the atmosphere considering ambient RH ranges. These observations provide fundamental properties necessary for improved predictions of air quality and aerosol chemistry such as reactive uptake of N2O5, size distributions, and mass concentrations of aerosol particles.

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Section: Introductionmentioning

confidence: 99%

Microscopic observation of a liquid-liquid-(semi)solid phase in polluted PM2.5

Gaikwad

Jeong²,

Kim³

et al. 2022

Front. Environ. Sci.

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“…Each factor has different effects on PM2.5. The relative humidity increases the weight of the particles themselves and plays a role in sedimentation [30]. Temperature affects PM2.5 concentration through atmospheric chemical reactions.…”

Section: And Aodmentioning

confidence: 99%

Estimation of PM2.5 concentration in Yangquan city based on MODIS image and meteorological data and analysis of spatial and temporal variation

Yao,

Liu,

Chen

et al. 2024

Preprint

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This study employed Moderate-Resolution Imaging Spectroradiometer (MODIS)aerosol optical depth data meteoro logical data, Digital Elevation Model (DEM), Normalized Difference Vegetation Index (NDVI), and ground monitoring data for particulate matter (PM2.5) to construct a model for estimating the PM2.5 concentration in Yangquan City, Shanxi Province, from 2018 to 2022. The spatial and temporal changes in the PM2.5 concentration were analyzed. The results revealed the following: (1) The random forest model was more accurate than the multiple linear regression model. The spring model R² increased by 59.7%, and The Root Mean Square Error(RMSE) decreased by 96.2%. The summer model R² increased by 110%, and the RMSE decreased by 96.3%. The autumn model R² increased by 12.4%, and the RMSE decreased by 95.3%. The winter model R² increased by 25%, and the RMSE decreased by 97.9%. (2) The concentration of PM2.5 decreased by 16.6 µg/m³ from 2018 to 2022. The highest concentration of PM2.5 was 55–85 µg/m³ in winter, and the lowest concentration of PM2.5 was 25–40 µg/m³ in summer. The spatial distribution ofPM2.5from the southwest to the northeast, first slightly decreased, then continued to rise, and then stabilized. From the northwest to the southeast, there was a low-middle and high-middle distribution pattern. The PM2.5 pollution was concentrated in the southern urban center and the main industrial areas.

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“…Visibility is related to the presence of haze and to atmospheric moisture because of the hygroscopicity of aerosols [ 2 ]. Reduced visibility caused by air pollutants and relative humidity (RH) has become a serious environmental problem [ 3 ]. Haze is detrimental to our physical health and quality of life [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Prediction and analysis of atmospheric visibility in five terrain types with artificial intelligence

Liang,

Chang,

Hsiao

et al. 2023

Heliyon

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Quantifying the impacts of PM2.5 constituents and relative humidity on visibility impairment in a suburban area of eastern Asia using long-term in-situ measurements

Cited by 28 publications

References 82 publications

Microscopic observation of a liquid-liquid-(semi)solid phase in polluted PM2.5

Microscopic observation of a liquid-liquid-(semi)solid phase in polluted PM2.5

Estimation of PM2.5 concentration in Yangquan city based on MODIS image and meteorological data and analysis of spatial and temporal variation

Prediction and analysis of atmospheric visibility in five terrain types with artificial intelligence

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