The AIVC board decided in their last (online) meeting of September 2020 to start a project to collect, discuss and disseminate information about COVID-19 in relation to ventilation and airtightness. A working group was created to define and carry out the project, with the title ‘Ventilation, airtightness and COVID-19’.

One of the outcomes of the project is the development of a number of questions and answers by working group members to address issues in relation to COVID‐19 and building ventilation in line with most recent scientific understanding. This 2^nd special issue of the AIVC newsletter presents a new set of question and answers provided by the working group.

Highlights of this newsletter:

• AIVC webinar “Building ventilation: How does it affect SARS-CoV-2 transmission?” – 1 April 2021 (17:00-18:30 CET)
• AIVC’s COVID‐19 Working Group FAQs
• REHVA calculator to estimate the effect of ventilation on COVID‐19 airborne transmission
• Previously published FAQ related to COVID‐19

The newsletter is freely accessible here.