From Maine Indoor Air Quality Council

Practical Building Recommendations to Reduce Virus Transmission
Updated 11/23/2020
Prepared by Kristofer G. Anderson, P.E., Bath, ME

Manage Your Home to Prevent COVID-19 (Written by Executive Director Christine Crocker for Green & Healthy Maine Homes Magazine)

The SAFEAIRSPACES COVID-19 Aerosol Relative Risk Estimator

Use your parameters for # of occupants, floor space/height, ventilation rate, filtration rate, time indoors, and use of masks to determine transmission risk.


ASHRAE Position Document on Airborne Infectious Disease

PD_-Infectious-Aerosols-2022_edited-January-2023.pdf (

Guidance for Building Operations During the COVID-19 Pandemic

COVID-19 Response Resources


Reopening Guidance from AIHA
More than 25 individual sets of guidance for specific facility types, from schools to laboratories, bars to day care facilities.
Homepage | Back to Work Safely

Reopening Guidance for Schools (K-12)

From U.C. Boulder

COVID-19 Transmission Estimator

From U.S. Environmental Protection Agency

On-Demand Webinar: Practices & Principles for Healthy IAQ & Reducing the Spread of Viruses

On Demand Webinar: New Tools to Assess and Address IAQ Health & Safety

On Demand Webinar: Layered Risk Reduction
Webinar: Indoor Air Quality in K-12 Schools: Addressing the Concept of Layered Risk Amidst COVID-19 | Creating Healthy Indoor Air Quality in Schools | US EPA

Indoor Air and Coronavirus (COVID-19)

From the Journal of Hospital Infection

Dismantling Myths of Airborne Transmission of COVID
Dismantling myths on the airborne transmission of severe acute respiratory syndrome coronavirus (SARS-CoV-2) – Journal of Hospital Infection


Guidance on Preparing Workplaces for COVID-19

From Johns Hopkins University

Active Map for COVID-19


HealthWeather Map: