Volume 11, Issue 4 (winter 2025)
johe 2025, 11(4): 334-344 |
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Rostami K, Bahmanipour S, Sayadi H, Souri S. Assessment of Classroom Air Quality using the Carbon Dioxide Index. johe 2025; 11 (4) : 6
URL: http://johe.umsha.ac.ir/article-1-966-en.html
URL: http://johe.umsha.ac.ir/article-1-966-en.html
1- Student Research Committee, Ilam University of Medical Sciences, Ilam, Iran
2- Non-Communicable Diseases Research Center, Ilam University of Medical Sciences, Ilam, Iran
3- Department of Occupational Health and Safety Engineering, School of Health, Ilam University of Medical Sciences, Ilam, Iran ,ssoury93@gmail.com
2- Non-Communicable Diseases Research Center, Ilam University of Medical Sciences, Ilam, Iran
3- Department of Occupational Health and Safety Engineering, School of Health, Ilam University of Medical Sciences, Ilam, Iran ,
Abstract: (1482 Views)
Background and Objective: High Carbon Dioxide (CO2) concentration can adversely affect the concentration and intellectual performance of students and teachers. The present study aimed to assess the air quality of classrooms using the CO2 index in classrooms at the School of Health.
Materials and Methods: CO2 concentration was measured using the Aeroqual device at 15, 30, 60, and 90 minutes in nine classes with three groups of students on different days (27 times). The data were analyzed in Stata software (version 18) using the generalized estimating equations technique, and responses were compared with standard values of CO2 concentration using t-tests.
Results: The results demonstrated that the air exchange rate varied from 0.01 to 1.39 times per hour, which was far from the standard limit. In most cases, the CO2 concentration exceeded the permissible limit after 15 minutes and continued to increase until the end of the class. Between 30 and 60 minutes, the concentration trend inside the classrooms was almost constant. The increasing trend continued until the end of the class.
Conclusion: The present study indicated that, according to the ASHRAE 62.1 Ventilation Standard and the recommendations of the World Health Organization, the ventilation rate in the classrooms was not sufficient. Therefore, it is recommended to improve the air quality of the classrooms by providing mechanical ventilation plans, especially in the cold seasons of the year.
Materials and Methods: CO2 concentration was measured using the Aeroqual device at 15, 30, 60, and 90 minutes in nine classes with three groups of students on different days (27 times). The data were analyzed in Stata software (version 18) using the generalized estimating equations technique, and responses were compared with standard values of CO2 concentration using t-tests.
Results: The results demonstrated that the air exchange rate varied from 0.01 to 1.39 times per hour, which was far from the standard limit. In most cases, the CO2 concentration exceeded the permissible limit after 15 minutes and continued to increase until the end of the class. Between 30 and 60 minutes, the concentration trend inside the classrooms was almost constant. The increasing trend continued until the end of the class.
Conclusion: The present study indicated that, according to the ASHRAE 62.1 Ventilation Standard and the recommendations of the World Health Organization, the ventilation rate in the classrooms was not sufficient. Therefore, it is recommended to improve the air quality of the classrooms by providing mechanical ventilation plans, especially in the cold seasons of the year.
Article number: 6
Keywords: Carbon dioxide concentration, Educational environment, Indoor air quality, Natural ventilation
Type of Study: Research Article |
Subject:
Chemical agents
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