September 21, 2020 CDC takes down update from web page https://www.washingtonpost.com/nation/2020/09/21/cdc-covid-aerosols-airborne-guidelines/
Timeline - A Ontario Society of Professional Engineers call on Ontario to refocus efforts on the airborne transmission of COVID-19
Timeline - A Public Health Agency of Canada releases a full pandemic ventilation guide, highlighting indoor aerosol spread
Timeline - A 363 physicians, scientists, occupational health and safety experts, engineers and nursing professionals send open letter to all levels of Canadian government, urging update of guidelines, regulations and public communication to reflect that COVID-19 spreads through inhaled aerosols.
