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 A number-based inventory of particle emissions by civil aviation and the influences on the particle number concentration near Zurich airport

10.29007/fqt3 ◽  
2019 ◽  
Author(s):  
Xiaole Zhang ◽  
Xi Chen ◽  
Luchi Zhang ◽  
Jing Wang
Keyword(s):  
Particulate Matter ◽  
Ultrafine Particles ◽  
Emission Inventory ◽  
Particle Number ◽  
Road Transport ◽  
Number Concentration ◽  
Civil Aviation ◽  
Particle Number Concentration ◽  
Trajectory Data ◽  
The Road

With the rapidly growing global air traffic, the impacts of the particulate matter (PM) in the aviation exhaust on climate, environment and public health are likely rising. The particle number and size distribution are crucial metrics for toxicological analysis and aerosol-cloud interactions. The modern aircraft engines are characterized by decreasing levels of mass emissions of particulate matter, leading to little contribution to the mass concentration. However, the abundant ultrafine particles in the aviation exhaust with diameters less than 100 nm may significantly increase the particle number concentration (PNC). Here we will introduce our recent studies on utilizing the Automatic Dependent Surveillance-Broadcast (ADS-B) from OpenSky network to develop the black carbon (BC) particle number emission inventory for global civil aviation and to investigate the influences of aviation emissions on the particle number concentration near Zurich airport.The developed inventory indicated that the BC particle number emission was approximately (10.9±2.1)×1025 per year with an average emission index of (6.06±1.18)×1014 per kg of burned fuel, which was about 1.3% of the total ground anthropogenic emissions, and 3.6% of the road transport emission.The preliminary dispersion results showed that the number concentration of volatile particles emitted by aviation was about 2 orders of magnitude higher than that of non-volatile particles. The annual mean contributions of the Zurich airport to the particle number concentrations ranged from about 105 cm-3 at the airport entrance to about 103 cm-3 at ETH Honggerberg (about 6 km away). There were about 1000 hours per year for the investigated locations to have more than 1000 cm-3 from the airport, with medians of about 104 cm-3.The OpenSky network ADS-B database provides a new opportunity to estimate the aviation emission using the detailed flight trajectory data. The dataset will contribute to reducing the uncertainties in the development of emission inventory, and improve the air quality simulation in the vicinities of airports.

scholarly journals Indoor and outdoor measurements of particle number concentration in near-highway homes

2013 ◽  
Vol 23 (5) ◽  
pp. 506-512 ◽  
Author(s):  
Christina H Fuller ◽  
Doug Brugge ◽  
Paige L Williams ◽  
Murray A Mittleman ◽  
Kevin Lane ◽  
...  
Keyword(s):  
Particle Number ◽  
Number Concentration ◽  
Particle Number Concentration ◽  
Indoor And Outdoor ◽  
Near Highway

Leaded Aviation Fuel May Present Long-Term Effects on Campus Life from the Adjacent Albert Whitted Airport

2020 ◽  
Author(s):  
Joseph Matthews ◽  
Madhu Pandey
Keyword(s):  
United States ◽  
Particulate Matter ◽  
The United States ◽  
Aviation Fuel ◽  
University Campus ◽  
Long Term Effects ◽  
Aviation Gasoline ◽  
Suspended Particulate ◽  
Descent Line

Propeller planes and small engine aircraft around the United States, legally utilize leaded aviation gasoline. The purpose of this experiment was to collect suspended particulate matter from a university campus, directly below an airport’s arriving flight path’s descent line, and to analyze lead content suspended in the air. Two collection sets of three separate samples were collected on six separate days, one set in July of 2018 and the second set in January 2019.

Saskatchewan Highways and Transportation Reduced Tire Pressure Initiative

1997 ◽  
Vol 1589 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Thomas L. Davies ◽  
Tami F. Wall ◽  
Allan Carpentier
Keyword(s):  
High Speed ◽  
Membrane Surface ◽  
Vehicle Stability ◽  
Road Maintenance ◽  
Long Term Effects ◽  
Tire Pressure ◽  
Reduced Pressure ◽  
Maintenance Costs ◽  
Short And Long Term

After examination of the research carried out by other agencies, Saskatchewan Highways and Transportation (SHT) embarked on an initiative to adapt low tire pressure technologies to the province's needs and environment. The focus of the initiative was to explore several technical questions from SHT's perspective: (a) Can low tire pressures be used to increase truck weights from secondary to primary without increasing road maintenance costs on thin membrane surface roads? (b) What are the short- and long-term effects of tire heating under high-speed/high-deflection constant reduced pressure (CRP) operations in a Saskatchewan environment? (c) What effects do lower tire pressures have on vehicle stability at highway speeds? To date, significant opportunities have been noted on local hauls (less than 30 min loaded at highway speeds) for CRP operation and long primary highway hauls that begin or end in relatively short secondary highway sections that limit vehicle weight allowed for the whole trip for central tire inflation technology. The background and environment for the initiative and the investigations and demonstrations envisioned and undertaken are briefly outlined.

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