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The CO2 assessment in a school classroom for an optimal natural ventilation strategy = The CO2 assessment in a school classroom for an optimal natural ventilation strategy

Patricia Guijarro Miragaya, Tania Estay Leal, Lucia Patrón Saade, Ricardo Tendero Caballero


doi:10.20868/bma.2021.3.4712

Abstract


Abstract

The global pandemic due to the COVID-19 disease has led to the study of school classrooms as possible vectors of contagion. The CO2 has been established with an easily captured indicator to determine the adequate ventilation of these spaces. However, continuous ventilation can cause a lack of comfort in students and therefore be detrimental to their cognitive development. Therefore, it is necessary to study an optimal way to ventilate and the objective of this study is to evaluate the CO2 of a school classroom to optimize natural ventilation, minimizing the loss of comfort and thus reducing the risk factor for COVID-19. CO2 and air flow measurements were carried out in three study days in a secondary school in Madrid in which tests were carried out on the closing and opening of doors and windows to determine the opening time necessary to reach an optimal level of CO2.

Resumen

La pandemia mundial por la enfermedad del COVID-19 ha llevado a estudiar las aulas escolares como posibles vectores de contagio. Se ha establecido el CO2 con un indicador de fácil captura para determinar la adecuada ventilación de estos espacios. Sin embargo, la ventilación continua puede ocasionar falta de confort en los estudiantes y por lo tanto ir en detrimento de su desarrollo cognitivo. Por lo tanto, es necesario estudiar una forma óptima de ventilar y el objetivo del presente estudio es evaluar el CO2 de un aula escolar en aras de optimizar la ventilación natural minimizando la pérdida de confort y así disminuir el factor de riesgo ante el COVID-19. Se realizaron mediciones de CO2 y caudal del aire en tres jornadas de estudio en un colegio de secundaria en Madrid en el cual se realizaron pruebas de cierre y apertura de puertas y ventanas para determinar el tiempo de apertura necesario para llegar a un nivel óptimo de CO2.


Keywords


Ventilation; CO2; COVID-19; education; Ventilación, CO2; COVID-19; educación.

References


Worldometer, «COVID Live Update: 154,298,022 Cases and 3,229,325 Deaths from the Coronavirus - Worldometer», may 04, 2021. https://www.worldometers.info/coronavirus/ (accedido may 04, 2021).

European Centre for Disease Prevention and Control, «Rapid Risk Assessment: Increased transmission of COVID-19 in the EU/EEA and the UK», European Centre for Disease Prevention and Control, oct. 23, 2020. https://www.ecdc.europa.eu/en/publications-data/covid-19-risk-assessment-increased-transmission-thirteenth-update (accedido may 04, 2021).

CDC, «Coronavirus Disease 2019 (COVID-19)», Centers for Disease Control and Prevention, feb. 11, 2020. https://www.cdc.gov/coronavirus/2019-ncov/science/science-briefs/scientific-brief-sars-cov-2.html (accedido may 04, 2021).

World Health Organization, «Coronavirus disease (COVID-19): How is it transmit-ted?», dic. 13, 2020. https://www.who.int/news-room/q-a-detail/coronavirus-disease-covid-19-how-is-it-transmitted (accedido may 04, 2021).

Y. Li et al., «Evidence for probable aerosol transmission of SARS-CoV-2 in a poorly ventilated restaurant», medRxiv, 2020, doi: 10.1101/2020.04.16.20067728.

S. L. Miller et al., «Transmission of SARS-CoV-2 by inhalation of respiratory aerosol in the Skagit Valley Chorale superspreading event», Indoor Air, vol. 31, n.o 2, pp. 314-323, mar. 2021, doi: 10.1111/ina.12751.

Y. Shen et al., «Community Outbreak Investigation of SARS-CoV-2 Transmission Among Bus Riders in Eastern China», JAMA Internal Medicine, vol. 180, n.o 12, pp. 1665-1671, dic. 2020, doi: 10.1001/jamainternmed.2020.5225.

K. A. Prather, L. C. Marr, R. T. Schooley, M. A. McDiarmid, M. E. Wilson, y D. K. Milton, «Airborne transmission of SARS-CoV-2», Science, vol. 370, n.o 6514, pp. 303-304, 2020, doi: 10.1126/science.abf0521.

D. K. Milton, «A Rosetta Stone for Understanding Infectious Drops and Aero-sols.», J Pediatric Infect Dis Soc, vol. 9, n.o 4, pp. 413-415, sep. 2020, doi: 10.1093/jpids/piaa079.

World Health Organization, «Coronavirus disease (COVID-19) advice for the public», abr. 09, 2021. https://www.who.int/emergencies/diseases/novel-coronavirus-2019/advice-for-public (accedido may 04, 2021).

M. Z. Salas Javier, «A room, a bar and a classroom: how the coronavirus is spread through the air», EL PAÍS, oct. 28, 2020. https://english.elpais.com/society/2020-10-28/a-room-a-bar-and-a-class-how-the-coronavirus-is-spread-through-the-air.html (accedido may 04, 2021).

J. S. Zafra Mariano, «An analysis of three Covid-19 outbreaks: how they hap-pened and how they can be avoided», EL PAÍS, jun. 17, 2020. https://english.elpais.com/spanish_news/2020-06-17/an-analysis-of-three-covid-19-outbreaks-how-they-happened-and-how-they-can-be-avoided.html (accedido may 04, 2021).

Cooperative Institute for Research in Environmental Sciences at the University of Colorado Boulder, «COVID-19 Airborne Transmission Tool Available», CIRES, jun. 25, 2020. https://cires.colorado.edu/news/covid-19-airborne-transmission-tool-available (accedido may 04, 2021).

Worldometer, «COVID Live Update: 154,298,022 Cases and 3,229,325 Deaths from the Coronavirus - Worldometer», may 04, 2021. https://www.worldometers.info/coronavirus/ (accedido may 04, 2021).

European Centre for Disease Prevention and Control, «Rapid Risk Assessment: Increased transmission of COVID-19 in the EU/EEA and the UK», European Centre for Disease Prevention and Control, oct. 23, 2020. https://www.ecdc.europa.eu/en/publications-data/covid-19-risk-assessment-increased-transmission-thirteenth-update (accedido may 04, 2021).

CDC, «Coronavirus Disease 2019 (COVID-19)», Centers for Disease Control and Prevention, feb. 11, 2020. https://www.cdc.gov/coronavirus/2019-ncov/science/science-briefs/scientific-brief-sars-cov-2.html (accedido may 04, 2021).

World Health Organization, «Coronavirus disease (COVID-19): How is it transmit-ted?», dic. 13, 2020. https://www.who.int/news-room/q-a-detail/coronavirus-disease-covid-19-how-is-it-transmitted (accedido may 04, 2021).

Y. Li et al., «Evidence for probable aerosol transmission of SARS-CoV-2 in a poorly ventilated restaurant», medRxiv, 2020, doi: 10.1101/2020.04.16.20067728.

S. L. Miller et al., «Transmission of SARS-CoV-2 by inhalation of respiratory aerosol in the Skagit Valley Chorale superspreading event», Indoor Air, vol. 31, n.o 2, pp. 314-323, mar. 2021, doi: 10.1111/ina.12751.

Y. Shen et al., «Community Outbreak Investigation of SARS-CoV-2 Transmission Among Bus Riders in Eastern China», JAMA Internal Medicine, vol. 180, n.o 12, pp. 1665-1671, dic. 2020, doi: 10.1001/jamainternmed.2020.5225.

K. A. Prather, L. C. Marr, R. T. Schooley, M. A. McDiarmid, M. E. Wilson, y D. K. Milton, «Airborne transmission of SARS-CoV-2», Science, vol. 370, n.o 6514, pp. 303-304, 2020, doi: 10.1126/science.abf0521.

D. K. Milton, «A Rosetta Stone for Understanding Infectious Drops and Aero-sols.», J Pediatric Infect Dis Soc, vol. 9, n.o 4, pp. 413-415, sep. 2020, doi: 10.1093/jpids/piaa079.

World Health Organization, «Coronavirus disease (COVID-19) advice for the public», abr. 09, 2021. https://www.who.int/emergencies/diseases/novel-coronavirus-2019/advice-for-public (accedido may 04, 2021).

M. Z. Salas Javier, «A room, a bar and a classroom: how the coronavirus is spread through the air», EL PAÍS, oct. 28, 2020. https://english.elpais.com/society/2020-10-28/a-room-a-bar-and-a-class-how-the-coronavirus-is-spread-through-the-air.html (accedido may 04, 2021).

J. S. Zafra Mariano, «An analysis of three Covid-19 outbreaks: how they hap-pened and how they can be avoided», EL PAÍS, jun. 17, 2020. https://english.elpais.com/spanish_news/2020-06-17/an-analysis-of-three-covid-19-outbreaks-how-they-happened-and-how-they-can-be-avoided.html (accedido may 04, 2021).

Cooperative Institute for Research in Environmental Sciences at the University of Colorado Boulder, «COVID-19 Airborne Transmission Tool Available», CIRES, jun. 25, 2020. https://cires.colorado.edu/news/covid-19-airborne-transmission-tool-available (accedido may 04, 2021).

Gobierno de España, «Evaluación del riesgo de transmisión de sars cov-2 mediante aerosoles», Ministerio de Sanidad. Dirección General de Salud Pública: Subdirección General de Sanidad Ambiental y Salud Laboral, nov. 2020. [En línea]. Disponible en: https://www.mscbs.gob.es/profesionales/saludPublica/ccayes/alertasActual/nCov/documentos/COVID19_Aerosoles.pdf.

D. A. Christopherson, W. C. Yao, M. Lu, R. Vijayakumar, y A. R. Sedaghat, «High-Efficiency Particulate Air Filters in the Era of COVID-19: Function and Efficacy», Otolaryngology - Head and Neck Surgery (United States), vol. 163, n.o 6, pp. 1153-1155, 2020, doi: 10.1177/0194599820941838.

S. Ham, «Prevention of exposure to and spread of COVID-19 using air purifiers: challenges and concerns», Epidemiology and Health, vol. 42, 2020, doi: 10.4178/epih.e2020027.

Gobierno de España y Ministerio para la Transición Ecológica y el Reto Demo-gráfico, RITE - Reglamento instalaciones térmicas en los edificios. 2007.

Harvard T.H. Chan School of Public Health, «5 Step Guide to Checking Ventila-tion Rates in Classrooms», Schools For Health. https://schools.forhealth.org/ventilation-guide/ (accedido may 04, 2021).

ASHRAE, «The Standards for Ventilation and Indoor Air Quality | Standards 62.1 & 62.2», ASHRAE, 2018. https://www.ashrae.org/technical-resources/bookstore/standards-62-1-62-2 (accedido may 04, 2021).

Instituto Nacional de Seguridad y Salud en el Trabajo, «La ventilación como medida preventiva frente al coronavirus SARS-CoV-2 - Portal INSST - INSST», Institu-to Nacional de Seguridad y Salud en el Trabajo, Ministerio de trabajo y Economía Social de España, ene. 2021. Accedido: may 04, 2021. [En línea]. Disponible en: https://www.insst.es.

P. F. Pereira y N. M. M. Ramos, «The impact of mechanical ventilation operation strategies on indoor CO2 concentration and air exchange rates in residential build-ings», Indoor and Built Environment, p. 1420326X20960767, oct. 2020, doi: 10.1177/1420326X20960767.

H. B. Stage, J. Shingleton, S. Ghosh, F. Scarabel, L. Pellis, y T. Finnie, «Shut and re-open: the role of schools in the spread of COVID-19 in Europe», medRxiv, p. 2020.06.24.20139634, ene. 2020, doi: 10.1101/2020.06.24.20139634.

Consejo Superior de Investigaciones Científicas, «Guía para ventilación de las aulas CSIC». nov. 03, 2020, [En línea]. Disponible en: https://www.csic.es/es/actualidad-del-csic/una-guia-del-csic-muestra-como-se-deben-ventilar-las-aulas-para-reducir-el.

C. Bonell et al., «An evidence-based theory of change for reducing SARS-CoV-2 transmission in reopened schools», Health & Place, vol. 64, p. 102398, jul. 2020, doi: 10.1016/j.healthplace.2020.102398.

J. Panovska-Griffiths et al., «Determining the optimal strategy for reopening schools, the impact of test and trace interventions, and the risk of occurrence of a second COVID-19 epidemic wave in the UK: a modelling study», The Lancet Child & Adolescent Health, vol. 4, n.o 11, pp. 817-827, nov. 2020, doi: 10.1016/S2352-4642(20)30250-9.

M. Griffiths y M. Eftekhari, «Control of CO2 in a naturally ventilated class-room», Energy and Buildings, vol. 40, n.o 4, pp. 556-560, ene. 2008, doi: 10.1016/j.enbuild.2007.04.013.

T. Salthammer et al., «Children’s well-being at schools: Impact of climatic conditions and air pollution», Environment International, vol. 94, pp. 196-210, sep. 2016, doi: 10.1016/j.envint.2016.05.009.

S. Petersen, K. L. Jensen, A. L. S. Pedersen, y H. S. Rasmussen, «The effect of increased classroom ventilation rate indicated by reduced CO2 concentration on the performance of schoolwork by children.», Indoor Air, vol. 26, n.o 3, pp. 366-379, jun. 2016, doi: 10.1111/ina.12210.

L. Chatzidiakou, D. Mumovic, y A. Summerfield, «Is CO2 a good proxy for indoor air quality in classrooms? Part 1: The interrelationships between thermal conditions, CO2 levels, ventilation rates and selected indoor pollutants», Building Services Engineering Research and Technology, vol. 36, n.o 2, pp. 129-161, ene. 2015, doi: 10.1177/0143624414566244.

F. R. d’Ambrosio Alfano, L. Bellia, y F. van Dijken, «Indoor Environment And Energy Efficiency In Schools», REHVA, 2010. https://www.rehva.eu/eshop/detail/indoor-environment-and-energy-efficiency-in-schools (accedido may 05, 2021).

Plataforma Edificatoria Passive House, «Publicación de Estudio de monitoriza-ción de colegios PEP», oct. 15, 2020. http://www.plataforma-pep.org/noticias/1412-publicacion-de-estudio-de-monitorizacion-de-colegios-pep (accedido may 04, 2021).

A. Alonso, J. Llanos, R. Escandón, J. J. Sendra, y P. Villoria-Sáez, «Effects of the COVID-19 Pandemic on Indoor Air Quality and Thermal Comfort of Primary Schools in Winter in a Mediterranean Climate.», Sustainability (2071-1050), vol. 13, n.o 5, pp. 2699-2699-2699, mar. 2021, doi: 10.3390/su13052699.

R. O. for E. World Health Organization, «School environment: Policies and current status», Organización Mundial de la Salud, s. Copenhagen, 2015. [En línea]. Disponible en: https://www.euro.who.int/__data/assets/pdf_file/0009/276624/School-environment-Policies-current-status-en.pdf.

L. Stabile, A. Massimo, L. Canale, A. Russi, A. Andrade, y M. Dell’Isola, «The Effect of Ventilation Strategies on Indoor Air Quality and Energy Consumptions in Classrooms», Buildings, vol. 9, n.o 5, 2019, doi: 10.3390/buildings9050110


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