Results 21 to 30 of about 18,582,204 (254)

Measurement report: The 4-year variability and influence of the Winter Olympics and other special events on air quality in urban Beijing during wintertime [PDF]

Atmospheric Chemistry and Physics, 2023
Comprehensive measurements are vital to obtain big enough datasets for better understanding the complex atmosphere and further improving the air quality.
Y. Guo, Y. Guo, C. Deng, C. Deng, A. Ovaska, F. Zheng, C. Hua, J. Zhan, Y. Li, J. Wu, Z. Wang, J. Xie, Y. Zhang, T. Liu, Y. Zhang, B. Song, W. Ma, Y. Liu, C. Yan, C. Yan, C. Yan, J. Jiang, V.-M. Kerminen, M. Xia, M. Xia, T. Nieminen, W. Du, W. Du, T. Kokkonen, T. Kokkonen, T. Kokkonen, M. Kulmala, M. Kulmala   +32 more
doaj   +1 more source

Molecular mechanism for rapid autoxidation in α-pinene ozonolysis

Nature Communications, 2021
Oxidation of volatile organic compounds leads to aerosol formation in the atmosphere, but the mechanism of some fast reactions is still unclear. The authors, using quantum chemical modelling and experiments, reveal that in key monoterpenes the cyclobutyl
Siddharth Iyer, Matti P. Rissanen, Rashid Valiev, Shawon Barua, Jordan E. Krechmer, Joel Thornton, Mikael Ehn, Theo Kurtén   +7 more
doaj   +1 more source

A Human-Relevant 3D In Vitro Platform for an Effective and Rapid Simulation of Workplace Exposure to Nanoparticles: Silica Nanoparticles as Case Study

Nanomaterials, 2020
In this contribution, we show the suitability of a 3D airway model, when coupled with a nebulizer system, for simulating workplace exposure to nanoparticles. As a proof of concept, workplace exposure to silica nanoparticles was experimentally measured in
Luisana Di Cristo, Fabio Boccuni, Sergio Iavicoli, Stefania Sabella   +3 more
doaj   +1 more source

Seasonal variation in oxygenated organic molecules in urban Beijing and their contribution to secondary organic aerosol [PDF]

Atmospheric Chemistry and Physics, 2022
Oxygenated organic molecules (OOMs) are crucial for atmospheric new particle formation and secondary organic aerosol (SOA) growth. Therefore, understanding their chemical composition, temporal behavior, and sources is of great importance.
Y. Guo, C. Yan, C. Yan, C. Yan, Y. Liu, X. Qiao, F. Zheng, Y. Zhang, Y. Zhou, C. Li, X. Fan, Z. Lin, Z. Feng, Y. Zhang, P. Zheng, P. Zheng, L. Tian, W. Nie, Z. Wang, D. Huang, K. R. Daellenbach, K. R. Daellenbach, L. Yao, L. Yao, L. Dada, L. Dada, F. Bianchi, J. Jiang, Y. Liu, V.-M. Kerminen, M. Kulmala, M. Kulmala   +31 more
doaj   +1 more source

Oligomer and highly oxygenated organic molecule formation from oxidation of oxygenated monoterpenes emitted by California sage plants [PDF]

Atmospheric Chemistry and Physics, 2020
Plants emit a diverse range of biogenic volatile organic compounds (BVOCs) whose oxidation leads to secondary organic aerosol (SOA) formation. The majority of studies of biogenic SOA have focused on single or simple multicomponent BVOC mixtures thought ...
A. Mehra, J. E. Krechmer, A. Lambe, C. Sarkar, L. Williams, F. Khalaj, A. Guenther, J. Jayne, H. Coe, D. Worsnop, C. Faiola, C. Faiola, M. Canagaratna   +12 more
doaj   +1 more source

Terrestrial or marine – indications towards the origin of ice-nucleating particles during melt season in the European Arctic up to 83.7° N [PDF]

Atmospheric Chemistry and Physics, 2021
Ice-nucleating particles (INPs) initiate the primary ice formation in clouds at temperatures above ca. −38 ∘C and have an impact on precipitation formation, cloud optical properties, and cloud persistence. Despite their roles in both weather and climate,
M. Hartmann, X. Gong, X. Gong, S. Kecorius, M. van Pinxteren, T. Vogl, T. Vogl, A. Welti, A. Welti, H. Wex, S. Zeppenfeld, H. Herrmann, A. Wiedensohler, F. Stratmann   +13 more
doaj   +1 more source

Different effects of anthropogenic emissions and aging processes on the mixing state of soot particles in the nucleation and accumulation modes [PDF]

Atmospheric Chemistry and Physics, 2022
In this study, the mixing state of size-resolved soot particles and their influencing factors were investigated based on a 5-month aerosol volatility measurement at a suburban site (Xingtai, XT) in the central North China Plain (NCP).
Y. Wang, Y. Wang, R. Hu, R. Hu, Q. Wang, Z. Li, M. Cribb, Y. Sun, X. Song, Y. Shang, Y. Wu, X. Huang, Y. Wang   +12 more
doaj   +1 more source

Evaluation of Multiangle Absorption Photometry for Measuring Aerosol Light Absorption [PDF]

, 2005
A new multiangle absorption photometer for the measurement of aerosol light absorption was recently introduced that builds on the simultaneous measurement of radiation transmitted through and scattered back from a particle-loaded fiber filter at multiple
Arnott, W.P., Sheridan, P.J., Petzold, A., Schloesser, H., Virkkula, A., Ogren, J.A.   +5 more
core   +1 more source

Airborne high spectral resolution lidar observation of pollution aerosol during EUCAARI-LONGREX [PDF]

, 2013
Airborne high spectral resolution lidar observations over Europe during the EUCAARI-LONGREX field experiment in May 2008 are analysed with respect to the optical properties of continental pollution aerosol.
A. Fix, Minikin, Andreas, M. Esselborn, Groß, Silke, Abicht, Florian, Fix, Andreas, A. Minikin, Fix, A., Abicht, F., Esselborn, Michael, S. Groß, F. Abicht, Wirth, M., Minikin, A., Esselborn, M., Groß, S., M. Wirth, Wirth, Martin   +17 more
core   +2 more sources

Influence of organic aerosol molecular composition on particle absorptive properties in autumn Beijing [PDF]

Atmospheric Chemistry and Physics, 2022
Organic aerosol (OA) is a major component of fine particulate matter (PM), affecting air quality, human health, and the climate. The absorptive and reflective behavior of OA components contributes to determining particle optical properties and thus their
J. Cai, J. Cai, C. Wu, J. Wang, W. Du, W. Du, F. Zheng, S. Hakala, S. Hakala, X. Fan, B. Chu, B. Chu, B. Chu, L. Yao, Z. Feng, Y. Liu, Y. Sun, J. Zheng, C. Yan, C. Yan, F. Bianchi, F. Bianchi, M. Kulmala, M. Kulmala, M. Kulmala, M. Kulmala, C. Mohr, K. R. Daellenbach, K. R. Daellenbach, K. R. Daellenbach   +29 more
doaj   +1 more source