Article
Construction & Building Technology
Minju Kim, Su-Gwang Jeong, Jongil Park, Sumin Kim, Jeong-Hun Lee
Summary: The relationship between PM and ambient humidity was evaluated through two experiments based on chemical composition and PM particle size analysis. The results showed that indoor PM concentrations were effectively decreased and prevented from spreading when the indoor relative humidity was above a certain threshold. However, increasing airtightness to increase indoor relative humidity may not be a practical solution in all cases.
BUILDING AND ENVIRONMENT
(2023)
Article
Thermodynamics
Alison J. Robey, Laura Fierce
Summary: In temperate climates, the peak in infection rates of enveloped viruses during the winter is likely heightened by seasonal variation in relative humidity within indoor spaces. Relative humidity impacts the seasonal transmission via inactivation rates rather than particle removal.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Environmental Sciences
Lina Gao, Zhiquan Liu, Dan Chen, Peng Yan, Yong Zhang, Heng Hu, Hong Liang, Xudong Liang
Summary: The study evaluated the impact of GPS-ZTD data assimilation on meteorology and aerosol simulations over the North China Plain. The assimilation of ZTD data improved the underestimation of ground relative humidity and surface pressure, as well as reducing the underestimation of PM2.5 and overestimation of visibility.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Meteorology & Atmospheric Sciences
P. Prasad, Ghouse Basha, M. Venkat Ratnam
Summary: In this article, the effect of ambient relative humidity (RH) on the optical properties of aerosols in different seasons and RH conditions over India is presented. The results show that aerosol scattering coefficient and total aerosol number concentration increase under high humidity conditions. Except in the monsoon season, an increase in aerosol optical depth (AOD) is observed as surface RH increases. The profile measurements also confirm an overall increase in AOD with increasing RH, with the strongest impact observed during winter. Overall, aerosols within the boundary layer are more sensitive to RH in the winter and monsoon seasons.
ATMOSPHERIC RESEARCH
(2023)
Article
Environmental Sciences
Chao Zhang, Longxiang Bu, Fengxian Fan, Nan Ma, Yueshe Wang, Yang Yang, Johannes Groess, Jinpei Yan, Alfred Wiedensohler
Summary: In this study, the hygroscopicity of aerosol particles composed of adipic acid and ammonium sulfate at 80-99.5% relative humidity was investigated using experimental and theoretical methods. A new model (Model 3 (UNIFAC)) was developed to account for the reduction of surface tension and the effects of bulk-surface partitioning of adipic acid on particle hygroscopicity. Results showed that the change in water activity had a greater impact on particle hygroscopicity than surface tension.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Environmental Sciences
Yang Yue, Jingru Cheng, Kang Soo Lee, Roman Stocker, Xu He, Maosheng Yao, Jing Wang
Summary: This study investigated the formation mechanism and influencing factors of sulfate in fine particles during haze episodes in different city environments through experiments and collected samples. The results revealed that relative humidity significantly affects the formation of new CaSO4.2H2O crystals.
ATMOSPHERIC ENVIRONMENT
(2022)
Article
Environmental Sciences
Kenji Miki
Summary: This study aimed to determine the relationship between the dynamics of potential pollinosis areas and annual meteorological factors. The results showed that pollen grains of C. japonica in Japan are distributed based on meteorological conditions until mid-March, after which they are distributed through flowering synchrony. Our study demonstrated that pollen production by C. japonica through flowering synchrony is a major cause of nationwide pollinosis and other allergy-related health problems.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Meteorology & Atmospheric Sciences
Al-Ekram Elahee Hridoy, Md. Abdul Mohiman, Shekh Md. Shajid Hasan Tusher, Sayed Ziaul Amin Nowraj, Mohammad Atiqur Rahman
Summary: The study found that meteorological conditions significantly affect the transmission of COVID-19 in Bangladesh, with mean temperature, relative humidity, and wind speed significantly associated with increased COVID-19 risk, while daily precipitation was negatively correlated with the risk of COVID-19 incidence. These findings provide important implications for future control and prevention measures in Bangladesh and other countries with similar climate conditions and population density.
THEORETICAL AND APPLIED CLIMATOLOGY
(2021)
Article
Engineering, Environmental
Mihnea Surdu, Houssni Lamkaddam, Dongyu S. Wang, David M. Bell, Mao Xiao, Chuan Ping Lee, Dandan Li, Lucia Caudillo, Guillaume Marie, Wiebke Scholz, Mingyi Wang, Brandon Lopez, Ana A. . Piedehierro, Farnoush Ataei, Rima Baalbaki, Barbara Bertozzi, Pia Bogert, Zoe Brasseur, Lubna Dada, Jonathan Duplissy, Henning Finkenzeller, Xu-Cheng He, Kristina Hohler, Kimmo Korhonen, Jordan E. Krechmer, Katrianne Lehtipalo, Naser G. A. . Mahfouz, Hanna E. Manninen, Ruby Marten, Dario Massabo, Roy Mauldin, Tuukka Petaja, Joschka Pfeifer, Maxim Philippov, Birte Rorup, Mario Simon, Jiali Shen, Nsikanabasi Silas Umo, Franziska Vogel, Stefan K. . Weber, Marcel Zauner-Wieczorek, Rainer Volkamer, Harald Saathoff, Ottmar Moehler, Jasper Kirkby, Douglas R. Worsnop, Markku Kulmala, Frank Stratmann, Armin Hansel, Joachim Curtius, Andre Welti, Matthieu Riva, Neil M. Donahue, Urs Baltensperger, Imad El Haddad
Summary: This study investigates the effect of high relative humidity (RH) on the gas-particle partitioning of biogenic oxidized organic molecules at low temperatures. The results demonstrate that high RH increases the partitioning of semivolatile compounds and leads to a shift in the chemical composition and volatility distribution of organic aerosols towards less oxygenated and more volatile species.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Chun-Yun Du, Wei Wang, Na Wang, Shu-Feng Pang, Yun-Hong Zhang
Summary: The chemical compositions in atmospheric aerosols evolve with pH and relative humidity, impacting reaction pathways and kinetics. Lower pH and higher relative humidity lead to changes in chemical reactions, providing insight into the evolution of aerosol composition. These findings contribute to a better understanding of the connection between chemistry and climate.
Article
Construction & Building Technology
Namhyuck Ahn, Sanghoon Park
Summary: This study evaluated the moisture performance of coated and non-coated timber hybrid window frames through humidity tests. The results showed that the coated frames had significantly improved dimensional stability and reduced surface defects.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Environmental Sciences
Tianzeng Chen, Biwu Chu, Qingxin Ma, Peng Zhang, Jun Liu, Hong He
Summary: This research revealed the complex influence of relative humidity (RH) on secondary organic aerosol (SOA) formation from aromatic VOCs, which include affecting the OH concentration, partitioning of advanced gas-phase oxidation products, and aqueous-phase oxidation processes. Further quantitative studies are needed to elucidate the role of RH in the partitioning of oxidation products and clarify the mechanism of the influence of RH on SOA formation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Chao Zhang, Nan Ma, Fengxian Fan, Yang Yang, Johannes Groess, Jinpei Yan, Longxiang Bu, Yueshe Wang, Alfred Wiedensohler
Summary: The hygroscopicity of atmospheric aerosol particles, especially those composed of oxalic acid (OA) and ammonium sulfate (AS), was studied at high relative humidity (RH = 80-99.5%) using a high humidity tandem differential mobility analyzer (HHTDMA). Experimental results were used to evaluate different models, and it was found that the prediction accuracy varied with particle size and composition at different RH levels. The hygroscopic growth factor (GF) and effective hygroscopicity parameter (lc) were found to be dependent on RH, particle size, and composition.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Environmental Sciences
Chao Zhang, Miaoran Lu, Nan Ma, Yang Yang, Yueshe Wang, Johannes Groess, Zhaoxia Fan, Mengyao Wang, Alfred Wiedensohler
Summary: The hygroscopicity of nanoscale particles containing surfactants was measured using HHTDMA, and a model that comprehensively accounts for the surfactant properties provided the best predictions for the experimental hygroscopicity. This study is important for understanding the hygroscopic characteristics of atmospheric aerosol particles.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Environmental Sciences
Kenneth S. Docherty, Robert Yaga, William T. Preston, Mohammed Jaoui, Theran P. Reidel, John H. Offenberg, Tadeusz E. Kleindienst, Michael Lewandowski
Summary: The experiments showed that oxidation of n-alkanes generates secondary organic aerosol with varying compositions and contributions from different species. Additionally, the study found that the yield and composition of SOA are sensitive to water vapor concentrations, with the impact being most significant within a specific humidity range.
ATMOSPHERIC ENVIRONMENT
(2021)