IAQ Research of the Month – January 2021

Jan 29, 2021

This newsletter highlights recent indoor air quality (IAQ) research including updates on COVID-19 research.

Research Summaries

When subjected to high CO2, body odor, and other bioeffluents, those with respiratory allergies performed worse in cognitive tests, reported more respiratory irritation, and had elevated inflammation markers when compared to the non-allergic. Indoor Air

Heat treatment with dry steam was effective at removing mold growth from masonry, especially when compared to hand scraping. Indoor Air

On a 60-year-old corrugated asbestos cement roof, exposed asbestos fibers were prone to mobilize, but no fibers were detected in outdoor air samples. JOEH

In a gym, chloraldimines were produced when sweaty surfaces were cleaned with a bleach‐based solution. Indoor Air

Ironing clothes can elevate the ultrafine particle concentrations by a factor ranging from 35 to 194. Building and Environment

In a review of research on the air exchange rates of homes around the world, the geometric mean was found to be 0.5 air changes per hour. Indoor Air

Construction workers with exposure to lead are an important source of lead dust in their homes. Environmental Research

According to a mathematical model, about 59% of all COVID-19 infections come from asymptomatic individuals: 35% from presymptomatic and 24% from those who remain asymptomatic. JAMA Network Open

For homemade face coverings, microfiber cloth demonstrated the highest filtration efficiency among the tested materials (and washing didn’t diminish performance too much). JOEH

Fit is critical to the level of protection offered by respirators. PLOS ONE

New terms should be used for the three main transmission routes of respiratory viruses: “drop spray”, “aerosol inhalation”, and “surface touch”. Indoor Air

A HEPA-based air cleaner providing over 5 air changes per hour reduces the airborne transmission risk for SARS-CoV-2. Pre-print

When air samples were collected inside the car of a COVID patient with mild symptoms, viable virus was only detected in the size range of 0.25 to 0.5 µm. Pre-print

Featured Online Course: CIH

The Certified Industrial Hygienist (CIH) designation is the most prestigious certification for professionals that evaluate indoor environments. Indoor Sciences’ CIH preparatory course (“CIH Crash Course”) is available exclusively through the American Industrial Hygiene Association (AIHA).

Our course has presentations on 19 different topics along with hundreds of practice questions and flashcards. Students gain access to the online course for 12 months from the date of registration. Let us help you take your career to the next level!

To register, visit the AIHA’s website: CIH Crash Course.

Additional Resources

Join me at the virtual IAQA Annual Meeting February 15-18. I’ll be moderating a debate, “Should Dirty Air Ducts be Cleaned?” Register here IAQA21 and get your questions ready for our panel!

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