scholarly journals Ultrafine Particle Number Concentration Model for Estimating Retrospective and Prospective Long-Term Ambient Exposures in Urban Neighborhoods

2020 ◽  
Vol 54 (3) ◽  
pp. 1677-1686 ◽  
Author(s):  
Matthew C. Simon ◽  
Elena N. Naumova ◽  
Jonathan I. Levy ◽  
Doug Brugge ◽  
John L. Durant
Keyword(s):  
Particle Number ◽  
Ultrafine Particle ◽  
Urban Neighborhoods ◽  
Number Concentration ◽  
Particle Number Concentration

SPATIAL DISTRIBUTION AND MODELING OF ULTRAFINE PARTICLE NUMBER CONCENTRATION IN A SWISS URBAN CITY

2013 ◽  
Vol 2013 (1) ◽  
pp. 4481
Author(s):  
Regina E. Ducret-Stich ◽  
Elisabetta Corradi ◽  
Maria Foraster ◽  
Xavier Morelli ◽  
Inmaculada Aguilera ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Particle Number ◽  
Ultrafine Particle ◽  
Number Concentration ◽  
Particle Number Concentration ◽  
Urban City

scholarly journals Indoor and Outdoor Particle Number Concentration in the Sapienza University Campus of Rome

2021 ◽  
Vol 13 (16) ◽  
pp. 9126
Author(s):  
Alessandro Di Menno di Bucchianico ◽  
Mariacarmela Cusano ◽  
Raffaela Gaddi ◽  
Alessandra Gaeta ◽  
Gianluca Leone ◽  
...  
Keyword(s):  
Ultrafine Particles ◽  
Particle Number ◽  
Number Concentration ◽  
Particle Number Concentration ◽  
University Campus ◽  
Long Term Effects ◽  
University Environment ◽  
Short And Long Term ◽  
Indoor And Outdoor

Exposure to ultrafine particles has been associated with short- and long-term effects on human health. The object of this paper was to assess Particle Number Concentration (PNC) and size distribution in a university environment and study the indoor/outdoor relationships. Measurements were carried out using co-located (indoor/outdoor) condensation particle counters and size spectrometers during two seasonal periods characterized by different meteorological conditions at five selected classrooms different for size, capacity, floor and use destination. PNC was dominated by particles in the ultrafine mode both indoor and outdoor. The indoor/outdoor ratios were on average between 1 and 1.2 in the summer and between 0.6 and 0.9 in the winter. Mostly the differences found among classrooms could be related to the condition of use (i.e., crowding, natural air exchange, air conditioning, seasonality). Only little differences were found among PNC measured immediately outside the classrooms. Based on information taken during the measurement campaigns, on the classrooms condition of use, it was possible to assess as a source of indoor particles in the coarse mode, the presence of students and teachers.

scholarly journals Ultrafine particle sources and in-situ formation in a European megacity

2015 ◽  
Vol 15 (4) ◽  
pp. 5663-5712 ◽  
Author(s):  
M. Pikridas ◽  
J. Sciare ◽  
F. Freutel ◽  
S. Crumeyrolle ◽  
S.-L. von der Weiden-Reinmüller ◽  
...  
Keyword(s):  
Particle Number ◽  
Ultrafine Particle ◽  
Number Concentration ◽  
Particle Number Concentration ◽  
Size Distributions ◽  
City Center ◽  
Ambient Particle ◽  
The City ◽  
Suburban Site

Abstract. Ambient particle number size distributions were measured in Paris, France during summer (1–31 July 2009) and winter (15 January–15 February 2010) at three fixed ground sites and using two mobile laboratories and one airplane. The campaigns were part of the MEGAPOLI project. New particle formation (NPF) was observed only during summer at approximately 50% of the campaign days, assisted by the low condensation sink (about 10.7 ± 5.9 × 10−3 s−1). NPF events inside the Paris plume were also observed at 600 m altitude onboard an aircraft simultaneously with regional events identified on the ground. Increased particle number concentrations were measured aloft also outside of the Paris plume at the same altitude, and were attributed to NPF. The Paris plume was identified, based on increased particle number and black carbon concentration, up to 200 km away from Paris center during summer. The number concentration of particles with diameter exceeding 2.5 nm measured on the surface at Paris center was on average 6.9 ± 8.7 × 104 and 12.1 ± 8.6 × 104 cm−3 during summer and winter, respectively, and was found to decrease exponentially with distance from Paris. However, further than 30 km from the city center, the particle number concentration at the surface was similar during both campaigns. During summer one suburban site in the NE was not significantly affected by Paris emissions due to higher background number concentrations, while the particle number concentration at the second suburban site in the SW increased by a factor of three when it was downwind of Paris.

scholarly journals Combining Measurements from Mobile Monitoring and a Reference Site To Develop Models of Ambient Ultrafine Particle Number Concentration at Residences

2018 ◽  
Vol 52 (12) ◽  
pp. 6985-6995 ◽  
Author(s):  
Matthew C. Simon ◽  
Allison P. Patton ◽  
Elena N. Naumova ◽  
Jonathan I. Levy ◽  
Prashant Kumar ◽  
...  
Keyword(s):  
Reference Site ◽  
Particle Number ◽  
Ultrafine Particle ◽  
Number Concentration ◽  
Particle Number Concentration ◽  
Mobile Monitoring
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