Indoor and outdoor air quality: A university cafeteria as a case study

Alves, Célia; Vicente, Estela D.; Evtyugina, Margarita; Vicente, Ana; Nunes, Teresa; Lucarelli, F.; Calzolai, Giulia; Nava, S.; Calvo, Ana; Blanco-Alegre, C.; Oduber, Fernanda; Castro, Amaya; Fraile, Roberto

doi:10.1016/j.apr.2019.12.002

Cited by 37 publications

(28 citation statements)

References 72 publications

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“…Oleic acid is a commonly emitted organic surfactant, with sources including marine , and urban emissions. − This has made it the compound of choice as a reactive organic surfactant aerosol proxy, e.g., see refs − . Its surface-active nature can cause it to form self-assembled nanostructures when mixed with water and its salt (sodium oleate), these are called lyotropic liquid crystal (LLC) phases. ,, These nanostructures can range from spherical micelles to lamellar multilayers and cylindrical arrangements with water channels, among others .…”

Section: Introductionmentioning

confidence: 99%

Exploring the Nanostructures Accessible to an Organic Surfactant Atmospheric Aerosol Proxy

et al. 2022

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The composition of atmospheric aerosols varies with time, season, location, and environment. This affects key aerosol properties such as hygroscopicity and reactivity, influencing the aerosol’s impact on the climate and air quality. The organic fraction of atmospheric aerosol emissions often contains surfactant material, such as fatty acids. These molecules are known to form three-dimensional nanostructures in contact with water. Different nanostructures have marked differences in viscosity and diffusivity that are properties whose understanding is essential when considering an aerosol’s atmospheric impact. We have explored a range of nanostructures accessible to the organic surfactant oleic acid (commonly found in cooking emissions), simulating variation that is likely to happen in the atmosphere. This was achieved by changing the amount of water, aqueous phase salinity and by addition of other commonly coemitted compounds: sugars and stearic acid (the saturated analogue of oleic acid). The nanostructure was observed by both synchrotron and laboratory small/wide angle X-ray scattering (SAXS/WAXS) and found to be sensitive to the proxy composition. Additionally, the spacing between repeat units in these nanostructures was water content dependent (i.e., an increase from 41 to 54 Å in inverse hexagonal phase d-spacing when increasing the water content from 30 to 50 wt %), suggesting incorporation of water within the nanostructure. A significant decrease in mixture viscosity was also observed with increasing water content from ∼104 to ∼102 Pa s when increasing the water content from 30 to 60 wt %. Time-resolved SAXS experiments on levitated droplets of this proxy confirm the phase changes observed in bulk phase mixtures and demonstrate that coexistent nanostructures can form in droplets. Aerosol compositional and subsequent nanostructural changes could affect aerosol processes, leading to an impact on the climate and urban air pollution.

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Section: Introductionmentioning

confidence: 99%

Exploring the Nanostructures Accessible to an Organic Surfactant Atmospheric Aerosol Proxy

et al. 2022

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“…6 Unsaturated fatty acids, such as oleic acid, have been identified as major contributors to urban cooking emissions up to PM10. [7][8][9][10] For this reason, oleic acid has been used as a proxy for the reactive fraction of cooking aerosols and as a representative of unsaturated fatty acids in the atmosphere, which makes it a well-studied model compound. [11][12][13][14][15][16][17][18][19][20] Solid and semi-solid phases have been observed for secondary organic aerosols.…”

Section: Introductionmentioning

confidence: 99%

The persistence of a proxy for cooking emissions in megacities: a kinetic study of the ozonolysis of self-assembled films by simultaneous small and wide angle X-ray scattering (SAXS/WAXS) and Raman microscopy

et al. 2021

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“…Accumulation in the indoor environment is an indication of insufficient ventilation. ASHRAE (Standard 62.1–2016) recommends a CO 2 amount below 1000 ppm for indoor environments (Belmonte et al , 2019; Alves et al , 2020). ASHRAE Standard 62 states that the difference of CO 2 amount between indoor and outdoor environments below 700 ppm is an indication that 80% of the people living indoors are satisfied (ASHRAE, A.N S.I.…”

Section: Methodsmentioning

confidence: 99%

Investigation of indoor air quality and thermal comfort condition in airport terminal buildings

Akyüz

Kafalı

Altuntaş

2020

AEAT

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Purpose This paper aims to measure the thermal comfort conditions and indoor air quality parameters, through on-site measurements taken in the areas mostly occupied by the passengers and airport staff. Terminal buildings consist of areas with various functions. Heating, ventilation and air conditioning requirements vary from area to area, thus leading to challenges in the management of indoor environment quality. Therefore, the study focuses on investigating the indoor environment conditions in various areas of the terminal buildings. Design/methodology/approach In this study, the thermal comfort and indoor air quality were evaluated based on the parameters [CO2 concentration, relative humidity, temperature, predicted mean vote (PMV) and predicted percentage of dissatisfied (PPD)] collected for summer 2019 from different zones inside the International Dalaman Airport terminal building located in the southwest of Turkey. The measurements were performed in the areas mostly occupied by the airport staff and passengers (check-in area, security control areas, international departure lounge, domestic departure lounge and baggage claim hall). Findings As a result of the study, it was observed that the CO2 concentration was 480–965 ppm, the relative humidity was 51.9–75.8% and the temperature was in the range of 23.9°C–28.3°C inside the airport terminal. The PMV values were determined to be in the range of −0.23 to 0.67, and the PPD values 5–15%, which are used to measure the thermal comfort conditions. Originality/value There has been limited study on the determination of the indoor air quality in airport terminals and the investigation of the thermal comfort conditions. However, in this study, indoor air quality and thermal comfort conditions were determined by on-site measurements in the five mostly occupied areas by passengers and employees in the terminal building.

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Indoor and outdoor air quality: A university cafeteria as a case study

Cited by 37 publications

References 72 publications

Exploring the Nanostructures Accessible to an Organic Surfactant Atmospheric Aerosol Proxy

Exploring the Nanostructures Accessible to an Organic Surfactant Atmospheric Aerosol Proxy

The persistence of a proxy for cooking emissions in megacities: a kinetic study of the ozonolysis of self-assembled films by simultaneous small and wide angle X-ray scattering (SAXS/WAXS) and Raman microscopy

Investigation of indoor air quality and thermal comfort condition in airport terminal buildings

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