ASHRAE Position Document on Indoor Carbon Dioxide

In March 2022, ASHRAE released a position document discussing the role of indoor CO2 in the context of building ventilation and IAQ. The positions address the use of CO2 as a metric of IAQ and ventilation, the impacts of CO2 on building occupants, the measurement of CO2 concentrations, the use of CO2 to evaluate and control outdoor air ventilation, and the relationship of indoor CO2 to airborne infectious disease transmission.

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Abstract Submission Deadline Extended! AIVC 2022 Conference, Rotterdam – 5-6 October, 2022

We would like to inform you that the abstract submission deadline for the 42nd AIVC - 10th TightVent - 8th venticool conference “Ventilation Challenges in a changing world" to be held on 5-6 October, 2022 in Rotterdam, has been extended.

Abstract submission is still open and due April 26, 2022

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AIVC 2022 Conference, Rotterdam – 5-6 October, 2022

The 42nd AIVC Conference “Ventilation Challenges in a changing world" will be held on October 5-6, 2022, at the Hilton Hotel, in Rotterdam, the Netherlands. It will be a joint event combined with the 10th TightVent and the 8th venticool conferences.

The conference programme will include well‐prepared and structured sessions focused on the conference topics, invited speakers and long and short oral presentations arising from the call.

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AIVC 2022 Conference, Rotterdam – 5-6 October, 2022

We are pleased to announce that the AIVC 2022 Conference “Ventilation Challenges in a changing world" is now accepting abstracts & proposals for topical sessions. The Conference will be held on October 5-6, 2022, at the Hilton Hotel, in Rotterdam, the Netherlands. It will be a joint event combined with the 10th TightVent and the 8th venticool conferences.

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5-6 October 2022, Conference, Rotterdam – 42nd AIVC conference

The 42nd AIVC conference: "Ventilation Challenges in a Changing World" will be held in the city of Rotterdam, the Netherlands together with the 10th TightVent and the 8th venticool conferences on October 5-6, 2022.

Conference Scope

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A simulation study of ventilation and indoor gaseous pollutant transport under different window/door opening behaviors

The window/door opening behavior of occupants is a very important factor in determining the airflows and ventilation conditions in buildings, on which indoor pollutant concentration and transport are highly dependent. A two-room residence model was simulated in this study to analyze the airflow characteristics and pollutant transport under different window/door opening behaviors. Airflows were unidirectional and the residence could not be treated as a well-mixed zone when there were no temperature differences.

IEA EBC Annex 68 - Indoor Air Quality Design and Control in Low Energy Residential Buildings – Setting the Metrics

This paper presents the initial reflections in the frame of Subtask 1 – Setting the Metrics of the IEA EBC Annex 68 – Indoor Air Quality Design and Control in Low Energy Residential Buildings. The first step of IEA Annex 68 aims at summarizing the current knowledge on target pollutants for residential buildings and at evaluating indoor air quality (IAQ), i.e. how to define indices that provide useful information allowing to achieve low risks for health in indoor spaces, and how to enable the comparison of solutions for achieving high IAQ taking into account energy efficiency.

REMARK: This Q&A was part of the AIVC special COVID-19 newsletter published in July 2021. To subscribe to the newsletter please click here.

REMARK: This Q&A was part of the AIVC special COVID-19 newsletter published in July 2021. To subscribe to the newsletter please click here.


Opening windows almost always reduces the risk of contamination with SARS-CoV-2. But it is important to be aware of low outdoor air temperatures that could affect the comfort of occupants and exacerbate related health problems. 

Although close contact transmission is the dominant transmission route, long-range airborne transmission through small size infected aerosols plays an important role in spreading COVID-19 in indoor spaces. Ventilation is air exchange between inside and outside; it dilutes the concentration of contaminants, and hence helps to control aerosol-based cross-infection risk of COVID-19.

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