Use of Direct Reading and Short Term Sampling of Indoor Air Quality in a Veterans Affairs Dental Clinic Laboratory for Select Air Contaminants

2013 ◽  
Vol 4 (1) ◽  
pp. 8-15
Author(s):  
Onwuka K. Okorie
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Veterans Affairs ◽  
Dental Clinic ◽  
Short Term ◽  
Direct Reading ◽  
Air Contaminants

Investigation of window-opening behaviour and indoor air quality in dwellings situated in the temperate zone in China

2020 ◽  
pp. 1420326X2092474
Author(s):  
Tingxuan Deng ◽  
Xiong Shen ◽  
Xiaojie Cheng ◽  
Junjie Liu
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Temperate Zone ◽  
World Health ◽  
Formaldehyde Concentration ◽  
Short Term ◽  
Night Time ◽  
Window Opening

Indoor air quality (IAQ) is a key factor that could affect the indoor environment and people's health. In this study, we report a comprehensive study on IAQ in 30 dwellings in the temperate zone in China. Thirty naturally ventilated dwellings were selected in the urban area of Kunming, which is the largest city in temperate zone in China. In four seasons, short-term measurement of formaldehyde and benzene, toluene, xylenes-volatile organic compounds and air infiltration rate were conducted in these dwellings. A long-term 1-year monitoring of temperature, relative humidity, fine particulate matter (PM2.5), carbon dioxide (CO2), window-opening behaviour and night-time air change rate (ACR) were conducted in 13 of these dwellings by remote sensors. Short-term measurements showed the mean formaldehyde concentration in summer (100.76 μg/m3), benzene concentration in winter (8.46 µg/m3), PM2.5 concentration (80.4 µg/m3) in spring of 2017 exceeded the Chinese standard, the US Office of Environmental Health Hazard Assessment value and the World Health Organization guidelines. The night-time ACR was the highest in summer (2.1 h−1) and the lowest in winter (1.6 h−1) in bedrooms of 13 long-term monitored dwellings due to seasonal time variation in window opening in bedrooms, which was mainly driven by CO2 concentration, indoor temperature and outdoor PM10 concentration.

Air pollution and pulmonary health: Effects of short-term indoor air quality intervention with portable air purifier

2016 ◽  
Vol 2016 (1) ◽  
Author(s):  
Ming Kei Chung ◽  
Xiaoxing Cui* ◽  
Lin Fang ◽  
Jianbang Xiang ◽  
Feng Li ◽  
...  
Keyword(s):  
Air Pollution ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Health Effects ◽  
Indoor Air ◽  
Short Term ◽  
Air Purifier

Investigation on Indoor Air Quality of Public Sites in Tainan Area

2011 ◽  
Vol 255-260 ◽  
pp. 1413-1417
Author(s):  
Yi Tun Wang ◽  
Jui Chi Chiu ◽  
Yi Chyun Hsu ◽  
Ting Nien Wu ◽  
Yun Hwei Shen ◽  
...  
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Direct Detection ◽  
Air Contaminants ◽  
Fitness Center ◽  
Potential Source ◽  
Crowd Control ◽  
Hospital School

This study selected 21 representative public sites for the survey of indoor air quality in Tainan area, including hospital, school, fitness center, government office, library, theater, transport station, and supermarket. Indoor air quality was first assessed by direct detection apparatus, including CO2, CO, HCHO, TVOCs, bacteria, fungi, PM10, PM2.5, O3 and temperature. Based on the results of walk-through detection, the spatial distribution of indoor air contaminants was further measured in a 24 hour period by the EPA standard method. The detailed measurements illustrated HCHO, O3, PM10 and PM2.5 concentrations are lower than the suggested threshold levels in all public sites. CO2 concentrations at hospitals and school are all exceeding category 1 threshold of 600 ppm. Bacteria exceeding the suggested threshold of 500 CFU/m3 for category 1 and 1000 CFU/m3 for category 2 is popular at most public sites. One fitness center was found exceeding the TVOCs threshold of 3 ppm, and outdoor air can be a potential source. The high levels of CO2 and bacteria were a common indoor air quality problem, and the regulated strategy of crowd control and air conditioning management was required for a healthy indoor environment.

scholarly journals The Determination of Indoor Air Quality and Thermal Comfort with Different Space and Ventilation in the Teracce and Bungalow Houses

2021 ◽  
Vol 16 (3) ◽  
pp. 774-793
Author(s):  
Nur Baitul Izati Rasli ◽  
Nor Azam Ramli ◽  
Mohd Rodzi Ismail
Keyword(s):  
Air Quality ◽  
Thermal Comfort ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Natural Ventilation ◽  
Ventilation System ◽  
Physical Parameters ◽  
Air Contaminants ◽  
Code Of Practice ◽  
Air Movement

This study observed the influence of different ventilation, indoor and outdoor activities (i.e., cooking, praying, sweeping, gathering, and exhaust from motorcycle) between a bungalow house (i.e., stack and cross ventilation applications) and a terrace house (i.e., one-sided ventilation application). We appraised the indoor air quality (IAQ) and thermal comfort. We monitored the indoor air contaminants (i.e., TVOC, CO, CH2O, PM10, O3, and CO2) and specific physical parameters (i.e., T, RH, and AS) for four days in the morning (i.e., 6.00 a.m. – 9.00 a.m.), morning-evening (i.e., 11.00 a.m. – 2.00 p.m.), and evening-night (i.e., 5.00 p.m. – 8.00 p.m.) sessions. The results found that cooking activities are the major activities that contributed to the increase of the TVOC, CO, PM10, O3, and CO2 concentrations in the bungalow and terrace houses. However, IAQ exceeded the Industry Code of Practice on IAQ (ICOP) limit in the terrace house. The bungalow house applies stack and cross ventilation, double area, and a long pathway of indoor air contaminants movements. Besides that, the results indicated that cooking activities worsen the ventilation system because CO2 exceeded the ICOP limit on Day 2 at 74.1 % (evening-night session) and Day 3 at 13.2 % (morning session), 11% (morning-evening session), and 50.1 % (evening-night session). Moreover, the combination of mechanical (i.e., opened all fans) and natural ventilation (i.e., opened all doors, windows, and fans) is the best application in the house without a cooking ventilator with lower indoor air movement. Furthermore, the temperatures exceeding the ICOP limit of 23-26 °C for both bungalow and terrace houses could be lower indoor air movement, which is less than the ICOP limit of 0.15-0.5 m/s and high outdoor air temperature. Therefore, it is prudent to have an efficient ventilation system for acceptable indoor air quality and thermal comfort in the family house.

scholarly journals Challenges for Indoor Air Quality Management

2021 ◽  
Vol 77 (4) ◽  
pp. 5
Author(s):  
Erem Admin ◽  
Violeta Kaunelienė
Keyword(s):  
Air Quality ◽  
Quality Management ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Developed Countries ◽  
Pollution Sources ◽  
Air Quality Management ◽  
Outdoor Air ◽  
Short Term ◽  
The Developed Countries

We live indoors. In the developed countries, people spent80-90% of time in buildings. Therefore, among the environmentalfactors, indoor air quality (IAQ) is a significant,if not the most significant, factor affecting human health.Scientific evidence has indicated that indoor air can bemore seriously polluted than the outdoor air in even thelargest and most industrialized cities. Indoor air pollutioncauses long- and short-term health problems and, dependingon the severity, can even make staying indoorsvery uncomfortable. Management of IAQ is a complicatedtask due to complexity of pollution sources and alimited number of measures applicable such as reducingcontaminants at the source, improving ventilation, and,when relevant, purifying the indoor air

Comparison of Indoor Air Quality Measurement by Using Direct Detection Apparatus and Standard Methods

2011 ◽  
Vol 230-232 ◽  
pp. 905-909 ◽  
Author(s):  
Pei Yi Kung ◽  
Yi Tun Wang ◽  
Jui Chi Chiu ◽  
Yi Chyun Hsu ◽  
Ting Nien Wu ◽  
...  
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Direct Detection ◽  
Hot Spot ◽  
Quality Measurement ◽  
Air Contaminants ◽  
Detailed Measurement ◽  
Standard Methods ◽  
The Impact

People usually spend almost 90% of time under various indoor surroundings in their daily lives, and thus the impact of indoor air quality (IAQ) on human health has received much attention recently. In this study, 20 public sites were selected as case studies to compare the difference of indoor air quality measurements. Indoor air quality was first assessed by direct detection apparatus, including CO2, CO, HCHO, TVOCs, PM10, PM2.5, and O3. Based on the results of walk-through detection, indoor air contaminants at hot-spot location were measured in a 24 hour period by the EPA standard method. The use of direct detection apparatus has the advantages of easy operation, high mobility, rapid detection, and less cost. However, official data of indoor air quality measurement is based on the detailed measurement by Taiwan EPA’s standard methods that possess high precision and accuracy. The comparison of direct detection data and the detailed measurements by standard methods illustrated that there exists a high linear relationship for CO2, PM10 and PM2.5 measurements. It means that direct detection data of CO2, PM10 and PM2.5 are reliable, and direct detection apparatus can be applied to monitoring of these indoor air contaminants for the better control of their accumulations.

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