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Author

Congrong He

Other affiliations: Jinan University, Murdoch University
Bio: Congrong He is an academic researcher from Queensland University of Technology. The author has contributed to research in topics: Particle number & Ultrafine particle. The author has an hindex of 30, co-authored 98 publications receiving 4328 citations. Previous affiliations of Congrong He include Jinan University & Murdoch University.


Papers
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Journal ArticleDOI
TL;DR: The aim of this work was to comprehensively review most of the studies published on this topic in China, including literature concerning field measurements, laboratory studies and the impacts of BB indoors and outdoors in China to provide a basis for formulation of policies and regulations by policy makers in China.

772 citations

Journal ArticleDOI
TL;DR: In this article, the effect of indoor sources on indoor particle concentrations as well as quantification of emission rates from the sources were quantified using house occupants' diary entries, and catalogued into 21 different types of indoor activities.

484 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated particle number and PM25 emissions from printers using the TSI SMPS, TSI CPC 3022 and TSI P-Trak and DustTrak.
Abstract: In modern society, printers are widely used in the office environment This study investigated particle number and PM25 emissions from printers using the TSI SMPS, TSI CPC 3022 and 3025A TSI P-Trak and DustTrak The monitoring of particle characteristics in a large open plan office, conducted continuously for over 48 hours, showed that particles generated by printers can significantly (p = 001) affect the submicrometer particle number concentration levels in the office An investigation of the submicrometer particle emissions produced by each of the 62 printers used in the office building was also conducted In terms of emission levels, the printers were divided into four classes of non-emitters, low, medium and high emitters, based on the particle concentrations in the immediate vicinity of the printers, after a short printing job It was found that about 60% of the investigated printers did not emit submicrometer particles and of the 40% that did emit particles, 27% were high particle emitters Particle emission characteristics from three different laser printers were also studied in an experimental chamber, which showed that particle emission rates are printer type–specific and are affected by toner coverage and cartridge age The average particle number emission rates from a printer in the class “low emitter‿ were 004×109 particle min-1 (new cartridge with 5% toner coverage); 421×109 particle min-1 and 954×109 particle min-1 for a “medium emitter‿ (old cartridge with 5% and 50% toner coverage, respectively); and 411×109 particle min-1 (old cartridge, 5% toner coverage), 928×109 particle min-1 (old cartridge, 50% toner coverage), 763×109 particle min-1 (new cartridge, 5% toner coverage) and 159×109 particle min-1 (new cartridge, 50% toner coverage) for a “high emitter‿ Particle size distributions indicated that the higher emitters tended to generate more ultrafine particles (< 01 µm) than the lower emitters whilst the trend in PM25 emissions was different, with the “low emitter‿ in having a PM25 emission rate of (029 ±007 µg min-1) and the “high emitter‿ showing nearly zero mass emissions While a more comprehensive study is still required to provide a better database of printer emission rates, as well as their chemical characteristics, the results from this study imply that submicrometer particle concentration levels in an office can be reduced by a proper choice of the printers

234 citations

Journal ArticleDOI
TL;DR: In this article, a summary of the indoor versus outdoor origin of indoor particles and compared the means to the WHO guidelines (for PM10 and PM2.5) and to the typical levels reported for urban environments.

225 citations

Journal ArticleDOI
TL;DR: In this article, the relationship between indoor and outdoor airborne particles was investigated for 16 residential houses located in a suburban area of Brisbane, Australia, using simultaneous and non-simultaneous measurement methods designed for the purpose of the study.

202 citations


Cited by
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Journal ArticleDOI
TL;DR: A compartmental model for assessing the community-wide impact of mask use by the general, asymptomatic public is developed, suggesting face masks are potentially of high value in curtailing community transmission and the burden of the COVID-19 pandemic.

956 citations

01 Dec 2006
TL;DR: This paper showed that reactive anthropogenic VOCs (AVOCs) produce much larger amounts of SOA than these models predict, even shortly after sunrise, and a significant fraction of the excess SOA is formed from first-generation AVOC oxidation products.
Abstract: [1] The atmospheric chemistry of volatile organic compounds (VOCs) in urban areas results in the formation of ‘photochemical smog’, including secondary organic aerosol (SOA). State-of-the-art SOA models parameterize the results of simulation chamber experiments that bracket the conditions found in the polluted urban atmosphere. Here we show that in the real urban atmosphere reactive anthropogenic VOCs (AVOCs) produce much larger amounts of SOA than these models predict, even shortly after sunrise. Contrary to current belief, a significant fraction of the excess SOA is formed from first-generation AVOC oxidation products. Global models deem AVOCs a very minor contributor to SOA compared to biogenic VOCs (BVOCs). If our results are extrapolated to other urban areas, AVOCs could be responsible for additional 3–25 Tg yr−1 SOA production globally, and cause up to −0.1 W m−2 additional top-of-the-atmosphere radiative cooling.

947 citations

Journal ArticleDOI
TL;DR: Nucleation and Growth of Nanoparticles in the Atmosphere Renyi Zhang,* Alexei Khalizov, Lin Wang, Min Hu, and Wen Xu.
Abstract: Nucleation and Growth of Nanoparticles in the Atmosphere Renyi Zhang,* Alexei Khalizov, Lin Wang, Min Hu, and Wen Xu Department of Atmospheric Sciences andDepartment of Chemistry, Center for Atmospheric Chemistry and Environment, Texas A&M University, College Station, Texas 77843, United States Department of Environmental Science & Engineering and Institute of Global Environment Change Research, Fudan University, Shanghai 200433, China State Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China

920 citations

Journal ArticleDOI
TL;DR: In this paper, the authors reviewed the nature of the particle emissions from road vehicles including both exhaust and non-exhaust (abrasion and re-suspension sources) and briefly reviewed the various methods available for quantification of the road traffic contribution.

891 citations