IAQ Research of the Month – January 2022

Jan 28, 2022

Summaries of the latest indoor air quality (IAQ) and COVID research

Research Summaries

Mother’s occupational exposure to indoor cleaning agents starting before or around conception and pregnancy was associated with more childhood asthma and wheeze in offspring. Journal of Allergy and Clinical Immunology

Using a natural gas stove without exhaust or proper ventilation can result in unhealthy amounts of nitrogen dioxide within a few minutes, particularly in smaller kitchens. Environmental Science & Technology

Contemporary levels of lead exposure during the first 8 years of life were associated with ADHD-related behaviors, specifically aggression, hyperactivity, and conduct problems. Journal of Exposure Science & Environmental Epidemiology 

Particles simulating SARS-CoV-2 transmitted between rooms connected by a central HVAC system, with reductions from improved filtration. The study did not look at virus viability or infectivity. Indoor Air

Gene editing was used to remove the major allergen associated with cats. Journal of Allergy and Clinical Immunology  

Toxic trace metals were found in house dust across a large, 35-country study. Environmental Science & Technology

COVID transmission occurred across a quarantine hotel hallway with only four brief episodes of simultaneous door opening. CDC Emerging Infectious Diseases Journal

Ventilation, filtration, and humidification substantially reduce the environmental aerosol viral load and should be prioritized to improve building health and safety. Clinical Infectious Diseases

A do-it-yourself air cleaner using MERV-13 filters and a box fan was able to achieve a high clean air delivery rate. Pre-print

At relative humidities below 50%, there was a near-instantaneous loss of infectivity in 50-60% of SARS-CoV-2. Pre-print

A passive sampler clipped to shirt collars detected the presence of SARS-CoV-2 in 8% of the community participants. Environmental Science & Technology Letters

Low indoor relative humidity favors the formation of amorphous solids on the outside of respiratory aerosols, which encapsulate and protect virions and bacteria within. This may help explain higher rates of disease transmission at low RHs for many viruses. PNAS

There are several organizations that offer mold remediation certifications. Only one organization offers certifications that are CESB accredited: the American Council for Accredited Certification (ACAC). ACAC maintains multiple levels of mold remediation certification. If you have two years of experience you can qualify for the Council-certified Microbial Remediator (CMR) and if you have 8 years of experience you can qualify for the Council-certified Microbial Remediation Supervisor (CMRS). They even have a non-accredited designation for individuals that are new to the industry (CRMR). 

Our online Microbial Remediator Course prepares you for all three of the ACAC mold remediation certifications. You can access the online content at any time of day or night. The format is an online PowerPoint presentation taught by Ian Cull with synchronized audio and practice questions. 

To learn more about this course, visit our page: Microbial Remediator Course.

Additional Resources

For the 20th year in a row, I’ll be attending the IAQA Annual Meeting!  Join me in Tucson, AZ February 22-25.

I’ll also be attending the AHR Expo next week in Las Vegas. I hope to see you around!

Ian Cull, PE, CIH
[email protected]
(312) 920-9393