scholarly journals Monitors to improve indoor air carbon dioxide concentrations in the hospital: A randomized crossover trial

2021 ◽  
pp. 151349
Author(s):  
Michaël R. Laurent ◽  
Johan Frans
Keyword(s):  
Carbon Dioxide ◽  
Indoor Air ◽  
Crossover Trial ◽  
Randomized Crossover Trial ◽  
Carbon Dioxide Concentrations

scholarly journals Transient Effects of Different Ventilation Methods on Car Indoor Air Quality

2015 ◽  
Vol 2 (1) ◽  
pp. 70 ◽  
Author(s):  
Feng-Chyi Duh
Keyword(s):  
Carbon Dioxide ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Air Conditioning ◽  
Heat Index ◽  
Transient Effects ◽  
Air Conditioning System ◽  
Carbon Dioxide Concentrations ◽  
Volatile Organic

This study investigated transient effects on the air quality of parked cars and moving cars with and without operating air conditioning. Carbon dioxide, carbon monoxide, volatile organic compounds, and formaldehyde concentrations were measured for comparative analysis. The results showed that simply changing the air conditioning system from internal circulation to external circulation to introduce air from outside reduces carbon dioxide concentrations by more than 50%, volatile organic compound concentrations by more than 77%, and the heat index from 0.1℃/min to less than 0.05 ℃/min. In order to conserve energy and improve car indoor air quality, this study can serve as a reference on healthy car environments.

scholarly journals Indoor carbon dioxide concentrations in Croatian elementary school classrooms during the heating season

2019 ◽  
Vol 70 (4) ◽  
pp. 296-302
Author(s):  
Dario Brdarić ◽  
Krunoslav Capak ◽  
Vlatka Gvozdić ◽  
Andrea Barišin ◽  
Jagoda Doko Jelinić ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Indoor Air ◽  
World Health ◽  
Heating Season ◽  
Regional Office ◽  
Carbon Dioxide Concentrations ◽  
Rural Elementary Schools ◽  
The World ◽  
Poor Ventilation ◽  
Health Organization

AbstractAware that exposure to stuffy indoor air with high levels of carbon dioxide (CO2) is associated with higher absenteeism and reduced academic performance in school pupils, the World Health Organization (WHO) Regional Office for Europe initiated indoor air quality surveys in schools, including CO2 monitoring, to assess ventilation and exposure to stuffy air. Here we report the findings of the first such survey in Croatia. It was conducted in 60 classrooms of 20 urban and rural elementary schools throughout the country during the heating season. Measurements of CO2 levels showed that all 60 classrooms exceeded the international guidelines of 1938 mg/m3. Mean CO2 concentrations ranged from 2771 to 7763 mg/m3. The highest concentration measured in urban schools was 7763 mg/m3 and in rural schools 4771 mg/m3. Average CO2 levels were higher in continental schools (3683 mg/m3) than the coastal ones (3134 mg/m3), but all demonstrate poor ventilation during the heating season all over Croatia.

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