scholarly journals Measurements of Indoor Air Pollutant Levels in a University Office Building

2007 ◽  
Vol 2 (4) ◽  
pp. 123-129 ◽  
Author(s):  
João F.P Gomes ◽  
J. C. M Bordado ◽  
Georgina Sarmento ◽  
José Dias
Keyword(s):  
Indoor Air ◽  
Chemical Species ◽  
Air Pollutant ◽  
Total Volatile ◽  
Organic Species ◽  
Pollutant Concentrations ◽  
Volatile Organic ◽  
Specific Individual ◽  
Total Volatile Organic Compounds ◽  
Indoor And Outdoor

This work consisted of a series of determinations performed in typical rooms of a building belonging to the Technical University of Lisbon, which is located in a central urban area of Lisbon. The main objective was to evaluate the Indoor Air Quality (IAQ) of the rooms so that further corrective measures could be taken if unsatisfactory IAQ levels were to be found. Correlations were derived, between indoor and outdoor pollutant concentrations, in order to assess the existence of contaminations coming from outside. Also, correlations were derived between total volatile organic compounds (VOC) concentrations and specific individual organic species measured in the same room. The methodology recorded in this paper is effective to assess compliance analysis of total VOCs, however, it seems somewhat limited to determine specific individual chemical species responsible for obtaining high total VOC concentrations.

scholarly journals Passive Sampling Method for Total Volatile Organic Compounds in Indoor Air

2018 ◽  
Vol 21 (1) ◽  
pp. 41-49
Author(s):  
Takahiro ISHIZAKA ◽  
Ayato KAWASHIMA ◽  
Naoki HISHIDA ◽  
Noriaki HAMADA
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Indoor Air ◽  
Passive Sampling ◽  
Sampling Method ◽  
Total Volatile ◽  
Volatile Organic ◽  
Total Volatile Organic Compounds

Multifunctional CeO2/Co3O4@polyacrylonitrile nanofibers for high-efficiency air-pollutant removal

2021 ◽  
pp. 004051752110457
Author(s):  
Qi Wang ◽  
Tingting Hu ◽  
Wenqi Zhang ◽  
Zhenlin Jiang ◽  
Pinhua Rao
Keyword(s):  
Air Pollutants ◽  
High Efficiency ◽  
Air Pollutant ◽  
Pollutant Removal ◽  
Total Volatile ◽  
Pressure Drops ◽  
Volatile Organic ◽  
Nanofiber Membranes ◽  
Total Volatile Organic Compounds ◽  
Pan Nanofiber

As many countries in the world are paying increasing attention to air quality, reducing the concentration of pollutants in the air, protecting human health and improving the ecological environment have become problems that need to be solved urgently. This paper describes how ceria and cobalt tetroxide@polyacrylonitrile (CeO2/Co3O4@PAN) nanofiber membranes are produced using electrospinning technology, which have broad applications for the removal of air pollutants. Results show that CeO2/Co3O4@PAN has high electrostatic attraction to particulate matter (PM). CeO2/Co3O4@PAN membranes show better mechanical properties, thermal stability and air-purification performance than pure PAN membranes. Nanofiber membranes with 5 wt% of CeO2/Co3O4 have excellent removal efficiency: 93.4% and 94.5% for PM2.5 and PM10, respectively, and 96.2% and 98% for formaldehyde and total volatile organic compounds, respectively. They also show low pressure drops, high stability and good recyclability. This work shows that they are promising candidates as highly stable, recyclable and efficient agents for the removal of air pollutants.

scholarly journals Effects of Night Ventilation on Indoor Air Quality in Educational Buildings—A Field Study

2021 ◽  
Vol 11 (9) ◽  
pp. 4056
Author(s):  
Sami Lestinen ◽  
Simo Kilpeläinen ◽  
Risto Kosonen ◽  
Maria Valkonen ◽  
Juha Jokisalo ◽  
...  
Keyword(s):  
Air Quality ◽  
Volatile Organic Compounds ◽  
Indoor Air Quality ◽  
Organic Compounds ◽  
Indoor Air ◽  
Total Volatile ◽  
Volatile Organic ◽  
Educational Buildings ◽  
Total Volatile Organic Compounds ◽  
Night Ventilation

Night ventilation methods have been used in educational buildings to guarantee indoor air quality at the beginning of occupied periods. A typical method has been to pre-start ventilation 2 h before the space usage. Another selection has been to ventilate a building continuously during the night with a minimum airflow rate that can dilute material emissions. In this study, the pre-started, continuous, and intermittent ventilation methods were compared by assessing indoor air quality in field measurements. The daytime ventilation was operating normally. The test periods lasted for 2 weeks. Indoor air quality was assessed by measuring the total volatile organic compounds and microbial concentrations using the quantitative polymerase chain reaction method. Additionally, the thermal conditions, carbon dioxide, and pressure differences over the building envelope were measured. The results show that the night ventilation strategy had negligible effects on microbial concentrations. In most cases, the indoor air microbial concentrations were only a few percent of those found outdoors. The averaged concentration of total volatile organic compounds was at the same level with all the night ventilation methods at the beginning of the occupied periods in the mornings. The concentrations reached a minimum level after 2-h ventilation. The concentrations of total volatile organic compounds were higher during the day than at night. This reveals that space usage had the largest effect on the total volatile organic compounds. Generally, the results show that continuous night ventilation does not significantly affect the biological and chemical contaminants. Consequently, a 2-h flushing period is long enough to freshen indoor air before occupancy.

Total Volatile Organic Compounds (TVOC) in Indoor Air Quality Investigations*

Indoor Air ◽  
1997 ◽  
Vol 7 (4) ◽  
pp. 225-240 ◽  
Author(s):  
L. Molhave ◽  
G. Clausen ◽  
B. Berglund ◽  
J. Ceaurriz ◽  
A. Kettrup ◽  
...  
Keyword(s):  
Air Quality ◽  
Volatile Organic Compounds ◽  
Indoor Air Quality ◽  
Organic Compounds ◽  
Indoor Air ◽  
Total Volatile ◽  
Volatile Organic ◽  
Total Volatile Organic Compounds
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