Article
Chemistry, Multidisciplinary
Miroslav Dado, Jozef Salva, Marian Schwarz, Miroslav Vanek, Lucia Bustin
Summary: This study found that different grit sizes of sandpaper used in oak wood sanding have an impact on particle concentration, whereas particle size distribution is not affected by grit size.
APPLIED SCIENCES-BASEL
(2022)
Review
Environmental Sciences
Yanhong Zhu, Ishaq Dimeji Sulaymon, Xiaodong Xie, Jianjiong Mao, Song Guo, Min Hu, Jianlin Hu
Summary: Particle number concentration (PNC) is an important parameter for evaluating the environmental health and climate effects of particulate matter (PM). This study reviewed PNC levels, trends, and sources in China and found significant spatial heterogeneity in PNC distribution. Traffic emissions were the major source of PNC in selected cities worldwide.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Shailendra Kumar Yadav, Rajeev Kumar Mishra, Bhola Ram Gurjar
Summary: The study evaluated the particle number size distribution of green cracker emissions and found that green crackers emit more particles with smaller diameters than traditional crackers. If the emission of small particles from green crackers can be controlled, using green crackers for celebrations may be an option.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Anja H. Tremper, Calvin Jephcote, John Gulliver, Leon Hibbs, David C. Green, Anna Font, Max Priestman, Anna L. Hansell, Gary W. Fuller
Summary: There is limited understanding regarding the health impacts of aircraft noise and aircraft-associated ultrafine particles (UFP). Measurements conducted near Gatwick airport in the UK showed a close relationship between particle number concentrations (PNC) and noise levels, with traffic emissions being the major source of PNC. However, UFP is unlikely to be a significant factor in epidemiological studies on aircraft noise and health, as the correlation between UFP and noise is moderate to low. Additionally, meteorological factors should be taken into consideration when studying the short-term associations between aircraft noise and health.
ENVIRONMENT INTERNATIONAL
(2022)
Article
Environmental Sciences
Yi-Tang Chang, Wen-Te Liu, I. -Chun Chen, Cheng-Che Chiang, Sai Hung Lau
Summary: Bioaerosols generated by fresh foods in Taiwan's traditional wet markets are considered significant biological contaminants that pose a biological hazard risk. This study investigates the distribution and characteristics of airborne bacteria (AB) in a typical public indoor wet market. The concentration of AB during market operations was found to be 1.55 x 103 CFU m-3. The presence of AB was influenced by the specific products being sold, with areas selling fresh poultry and livestock meat showing higher concentrations. The size distribution of AB indicated a potential biological hazard, with particles in the range of 2.1 to 3.3 μm being the most frequent and likely to deposit in the respiratory tract.
AEROSOL AND AIR QUALITY RESEARCH
(2023)
Article
Energy & Fuels
Debiao Li, Qiangzheng Jing, Yueshe Wang, Liejin Guo
Summary: Based on laser-diffraction technique, the maximum entropy technique is applied to measure particle number concentration and size distribution in pneumatic transport. The results show that particle number concentration increases linearly with wind speed, while the mean particle size decreases exponentially within a certain height range.
Article
Environmental Sciences
Dongjie Shang, Lizi Tang, Xin Fang, Lifan Wang, Suding Yang, Zhijun Wu, Shiyi Chen, Xin Li, Limin Zeng, Song Guo, Min Hu
Summary: This study reveals the changes in particle number concentration (PN) and particle number size distribution (PNSD) in Beijing from 2013 to 2019. It shows that PN decreased from 2013 to 2017, but increased from 2017 to 2019. Factors associated with primary emissions, such as coal combustion and biomass burning, were found to decrease continuously, while factors related to new particle formation (NPF) and secondary oxidation increased in recent years. This study emphasizes the importance of NPF in urban atmosphere under continuous air quality improvement.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Dongmei Zhang, Zhanqing Li, Hao Wu, Tong Wu, Rongmin Ren, Zhaoxin Cai, Chen Liang, Lu Chen
Summary: Air pollution is a major concern in densely populated megacities in China. A series of experiments conducted in Beijing, Shanghai, and Guangzhou revealed that ultrafine particles constitute a high proportion of aerosol pollutants in these cities. The concentration of these particles increases at nighttime due to traffic emissions.
ATMOSPHERIC ENVIRONMENT
(2022)
Article
Plant Sciences
Zhe Yin, Yuxin Zhang, Keming Ma
Summary: The study found that the distribution of PM inside and outside green spaces is size-dependent, based on measurements in 188 green spaces in Beijing city. It highlights the importance of size dependence in understanding the mechanism of PM distribution in urban green space and introduces a new concept of particle size classification.
URBAN FORESTRY & URBAN GREENING
(2021)
Article
Chemistry, Multidisciplinary
Tiancong Zhao, Runfeng Lin, Borui Xu, Minchao Liu, Liang Chen, Fan Zhang, Yongfeng Mei, Xiaomin Li, Dongyuan Zhao
Summary: This study investigates the fluid dynamics effects of nanoparticles' interaction with biological barriers. Janus nanoparticles with a badminton-like structure were successfully synthesized, and they showed more stable movement in fluid and reduced organ uptakes compared to conventional spherical nanoparticles.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Tiancong Zhao, Runfeng Lin, Borui Xu, Minchao Liu, Liang Chen, Fan Zhang, Yongfeng Mei, Xiaomin Li, Dongyuan Zhao
Summary: While previous studies on the interaction between nanoparticles and biological barriers mainly focus on the static state, this research investigates the fluid dynamics of nanoparticles and their impact on encountering biological hosts. The researchers successfully synthesized badminton-like Fe3O4&mPDA Janus nanoparticles and studied their stable fluid posture and motion characteristics. The results show that these nanoparticles have reduced blood vessel wall encountering frequency and longer blood half-life compared to conventional spherical nanoparticles.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Shenlin Yang, Fang Pu, Zhen Wang, Zhaoqi Liu, Manhou Li
Summary: The number concentration and size distribution of soot aerosols are influenced by air pressure, with a linear relationship between number concentration and size distribution.
FIRE AND MATERIALS
(2022)
Article
Environmental Sciences
Ana Cvitesic Kusan, Jurica Baranasic, Sanja Frka, Tomo Lucijanic, Andrej Sribar, Jelena Knezevic, Giorgio Buonanno, Luca Stabile
Summary: Characterizing the size distribution of airborne particles carrying SARS-CoV-2 virus is crucial for understanding and predicting the transmission and spreading of COVID-19. This study reports on the concentration and size distribution of SARS-CoV-2 genetic material in airborne particles collected from hospital and home environments. The results suggest the need for protective masks, especially in hospital settings.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Green & Sustainable Science & Technology
Alessandro Di Menno di Bucchianico, Mariacarmela Cusano, Raffaela Gaddi, Alessandra Gaeta, Gianluca Leone, Fabio Boccuni, Riccardo Ferrante, Armando Pelliccioni, Giorgio Cattani
Summary: The study assessed the Particle Number Concentration and size distribution in a university environment, finding that PNC was dominated by ultrafine particles both indoors and outdoors. Differences among classrooms were mainly related to usage conditions, while little variation was found in PNC measured outside the classrooms.
Article
Environmental Sciences
Sen Wu, Jiangchuan Tao, Nan Ma, Ye Kuang, Yanyan Zhang, Yao He, Yele Sun, Wanyun Xu, Juan Hong, Linhong Xie, Qiaoqiao Wang, Hang Su, Yafang Cheng
Summary: This study measured the microphysical and chemical properties of particles in fog, and analyzed their influence on fog droplet evolution. The results showed that after fog dissipates, particles larger than 200 nm were hardly detected under the PM1 inlet, indicating that fog droplets are generally smaller than 10 μm and can be sampled by the PM10 inlet. The study also found that the hygroscopicity of PM1 was overestimated, potentially leading to significant bias in the estimated droplet number concentration.
ATMOSPHERIC ENVIRONMENT
(2022)
