scholarly journals Indoor Air Quality Assessment Based on Human Physiology - Part 1. New Criteria Proposal

10.14311/492 ◽  
2003 ◽  
Vol 43 (6) ◽  
Author(s):  
M. V. Jokl
Keyword(s):  
Human Physiology ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Human Perception ◽  
Odor Intensity ◽  
Air Quality Assessment ◽  
Volatile Organic ◽  
Carbon Dioxide Co2 ◽  
New Criteria

Human physiology research makes evident that the Weber-Fechner law applies not only to noise perception but also to the perception of other environmental components. Based on this fact, new decibel units for dor component representing indoor air quality in majority locations have been proposed: decicarbdiox dCd (for carbon dioxide CO2) and decitvoc dTv (for total volatile organic compound TVOC). Equations of these new units have been proved by application of a) experimental relationships between odor intensity (representing odor perception by the human body) and odor concentrations of CO2 and TVOC, b) individually  measured CO2 and TVOC levels (concentrations) – from these new decibel units can be calculated and their values compared with decibel units of noise measured in the same locations. The undoubted benefit of using the decibel scale is that it gives much better approximation to human perception of odor intensity compared to the CO2 and TVOC concentration scales.

scholarly journals Indoor Air Quality Evaluation of Commercial Buildings In Kuantan

2018 ◽  
Vol 225 ◽  
pp. 05018
Author(s):  
Noor Huwaida Yahaya ◽  
Ftwi Yohaness Hagos ◽  
Mohamad Firdaus Basrawi
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Quality Evaluation ◽  
Commercial Buildings ◽  
Volatile Organic ◽  
Health And Illness ◽  
Carbon Dioxide Co2 ◽  
Pm 10 ◽  
Respirable Particulate

This work focuses on indoor air quality evaluation of commercial buildings in Kuantan. Some buildings have been selected to monitor indoor air quality. The research has been carried out only in Kuantan, which focused on hotels and government buildings. Some sample measurements were taken which include air temperature, relative humidity, and air movement, carbon monoxide (CO), carbon dioxide (CO2), ozone (O3), respirable particulate matter (PM 10), formaldehyde and total volatile organic compound (TVOC). In addition, questionnaires were conducted on a number of workers in each building to determine the level of health and illness caused by air in the building where they work. Hence, this study has analyzed the link between the questioner results and the results of indoor air measurements that were carried out. From surveys, it appears there are four buildings that have low air flow, four buildings have a lot of dust and five buildings have a high temperature. In contrast, four buildings have a good indoor air quality.

scholarly journals Effects of Ventilation Improvement on Measured and Perceived Indoor Air Quality in a School Building with a Hybrid Ventilation System

2018 ◽  
Author(s):  
Camilla Vornanen-Winqvist ◽  
Kati Järvi ◽  
Maria A. Andersson ◽  
Kaiser Ahmed ◽  
Sander Toomla ◽  
...  
Keyword(s):  
Air Quality ◽  
Volatile Organic Compounds ◽  
Indoor Air Quality ◽  
Organic Compounds ◽  
Indoor Air ◽  
Ventilation System ◽  
Volatile Organic ◽  
Hybrid Ventilation ◽  
Carbon Dioxide Co2 ◽  
Operational Error

This paper describes a case study of ventilation as well as measured and perceived indoor air quality (IAQ) in a Finnish comprehensive school with a hybrid ventilation system and reported IAQ problems. An operational error was found when investigating the ventilation system that prevented air from coming into classrooms, except for short periods of high carbon dioxide (CO2) concentrations. However, results indicated that hybrid ventilation system was able to provide adequate ventilation and sufficient IAQ once properly designed and maintained. After ventilation operation was improved, occupants reported less unpleasant odors and stuffy air. The amount of total volatile organic compounds (TVOC) and some single volatile organic compounds (VOCs) decreased. Indoor mycobiota was observed in settled dust in the classrooms, from which ventilation improvement eliminated the dominant, opportunistic human pathogen species Trichoderma citrinoviride found before improvement.

scholarly journals Indoor Air Quality Assessment Based on Human Physiology - Part 2. Limits

10.14311/494 ◽  
2003 ◽  
Vol 43 (6) ◽  
Author(s):  
M. V. Jokl
Keyword(s):  
Human Physiology ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Short Term ◽  
Power Stations ◽  
Guidance Note ◽  
Air Quality Assessment ◽  
Optimal Value

In order to evaluate indoor air quality in practice it is necessary to establish limits, or more exactly, tolerable ranges for unadapted and adapted persons. The optimal value overwhelmingly corresponds to PD 20 %. A better value of PD 10 % could be prescribed for asthmatics and for persons with increased requirements, i.e. those allergic to the environment and operators in airport control towers and atomic power stations. A worse value PD 30 % could be accepted as an admissible value. These values differ for unadapted and adapted persons (as introduced by BSR/ASHRAE 62-1989 R). The long-term tolerable value is the end of SBS range (for CO2 it is based on USSR space research, for TVOC on Molhave). The short-term tolerable value is the beginning of the toxic range (for CO2 it is taken from British Guidance Note EH 40/90; for TVOC from Molhave).

scholarly journals Indoor Air Quality Assessment Based on Human Physiology - Part 3. Applications

10.14311/496 ◽  
2003 ◽  
Vol 43 (6) ◽  
Author(s):  
M. V. Jokl
Keyword(s):  
Human Physiology ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Evaluation System ◽  
Accurate Estimation ◽  
Air Volume ◽  
Air Quality Assessment ◽  
Environmental Component ◽  
Total Environment

The proposed evaluation system allows something quite new: a) the assessment of the effect of each environmental component (constituent) on the total environment level, b) accurate estimation of air volume for various locations, human occupations and sources of harmful gases. Additional benefits are listed at the conclusion of this part.

scholarly journals The Improvement of Indoor Air Quality in Residential Buildings in Dubai, UAE

Buildings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 250
Author(s):  
Chuloh Jung ◽  
Jihad Awad
Keyword(s):  
Computer Simulation ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Building Materials ◽  
Field Survey ◽  
Residential Buildings ◽  
Radon Gas ◽  
Volatile Organic ◽  
Residential Projects

Due to unprecedented urbanization, UAE had built many new residential projects with poor choices of material and ventilation. This social phenomenon is leading UAE to Sick Building Syndrome (SBS) faster than any other countries. The Dubai Municipality regulates the indoor air quality with strict stipulation, but the detailed regulations are still insufficient. The objective of this paper is to measure the indoor air quality of new residential projects in Dubai to suggest the improvement of the regulations for indoor air quality. As a methodology, a field survey was conducted to investigate the status of indoor air pollution in residential buildings. Based on the field survey data, lab experiments for building materials were conducted and a computer simulation on radon gas was conducted. The result had shown that radon gas was mainly detected in new townhouses and labor camp houses, and its concentration was found to exceed the standard. Volatile organic solvents (VOCs) and formaldehyde (CH2O) were mainly detected in showhouses and new townhouses, and the concentration distribution was about 10 times higher than that of outdoors. It was proven that emission concentration of radon gas from various building materials were detected, and the order was red clay, gypsum board, and concrete. Volatile organic solvents (VOCs) are mainly detected in oil paints and PVC floor and the radiation amount of all pollutants increased with temperature increase. In computer simulation, it was found that a new townhouse needs a grace period from 20 days to 6 months to lower the radon gas concentration by 2 pCi/L. This study will serve as a basic data to establish more detailed regulation for the building materials and improve the IAQ standards in Dubai.

Indoor air quality assessment at care centre ABC, Malaysia

2018 ◽  
pp. 39-42
Author(s):  
Kamarul Aini Mohd Sari ◽  
Khaleda Farhah Almar Mastaza ◽  
Mohammad Ashraf Abdul Rahman ◽  
Mohd Kamaruzaman Musa ◽  
Mariah Awang ◽  
...  
Keyword(s):  
Air Quality ◽  
Quality Assessment ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Care Centre ◽  
Air Quality Assessment

scholarly journals Remote Work and the Environment: Exploratory Analysis of Indoor Air Quality of Commercial Offices and the Home Office

2021 ◽  
Author(s):  
Kamrie Sarnosky ◽  
Mark Benden ◽  
Leslie Cizmas ◽  
Annette Regan ◽  
Garett Sansom
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Indoor Air Pollution ◽  
Home Office ◽  
Adverse Health Effects ◽  
Home Based ◽  
Increased Risk ◽  
Carbon Dioxide Co2 ◽  
Total Volatile Organic Compounds

Abstract Background: The COVID-19 pandemic has accelerated an already existing trend of individuals increasingly working remotely. With the growing popularity of remote working, specifically in a home office, there is a critical need to better understand and characterize the potential environmental differences between these two spaces. Indoor air pollution can have adverse health effects and impair cognitive functioning. Methods: This small pilot cohort study (N=22) recruited home and office workers to better understand the indoor air quality between these spaces. Air contaminants collected and assessed included PM10 and PM2.5, carbon dioxide (CO2), and total volatile organic compounds (TVOCs). Results: Findings showed a strong statistically significant increase in all measured variables within homes in comparison to traditional offices (p<0.001). For instance, The mean PM2.5 level in the traditional office space was 1.93 µg/m3 whereas it was more than twice this amount (5.97 µg/m3) in home offices.Conclusion: These results indicate that those who work from home are at increased risk due to longer exposures to higher levels of certain contaminants, the importance to better develop interventions to mitigate this reality is underscored by the fact that many workers will be moving to home-based offices in the coming years.

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