Ventilation for Designing Better Buildings

Poor Indoor Air Quality Hurts Productivity

Posted by Sarah Lozanova

Mar 1, 2017 3:14:12 PM

Studies have linked worker productivity, mood, and cognitive function to indoor air quality, but ventilation solutions exist for healthier indoor air.

Poor Indoor Air Quality Hurts Worker ProductivityAs companies seek to improve their bottom line, many examine worker productivity as a means of cutting costs and boosting revenue. Worker productivity, measured by the goods and services produced in an hour, has been on a downward slide, according to recent reports. Indoor pollutants are increasingly recognized as affecting overall health, but studies are also linking indoor air quality to cognitive function and mood. Inadequate ventilation, elevated levels of carbon dioxide (CO2), and indoor pollutants can hinder one’s ability to focus, concentrate, and respond to crises.


Harvard study links productivity, indoor air quality, and ventilation

The Harvard T. H. Chan School of Public Health’s Center for Health and the Global Environment, SUNY Upstate Medical University, and Syracuse University conducted a groundbreaking double-blind study in 2015. The participants, including architects, engineers, designers, programmers, and marketing professionals, continued their regular work for six days while some were exposed to elevated levels of volatile organic compounds and CO2. The others, the green+ participants, had lower volatile organic compound levels and enhanced ventilation. All participants completed cognitive tests at the end of each day.

The cognitive function scores of the green+ participants were twice as high on average as those of the employees in conditions with elevated levels of contaminants. When examining nine cognitive domains, researchers found the largest differences in crisis response, with scores 131% higher in the green+ group; strategy, at 288% higher; and information usage, at 299% higher.

According to the study, “people who work in well-ventilated offices with below-average levels of indoor pollutants and CO2 have significantly higher cognitive functioning scores—in crucial areas such as responding to a crisis or developing strategy—than those who work in offices with typical levels.”

Poor indoor air quality is frequently overlooked

As buildings become increasingly energy efficient, they are also becoming more airtight. This means that less air is exchanged through the building envelope, causing air pollutants to get trapped inside the building. Ventilation is a leading strategy for boosting indoor air quality, but its importance is often overlooked.

“We have been ignoring the 90%,” says Joseph Allen, director of the Healthy Buildings Program at the Harvard Center for Health and the Global Environment, and lead author of the study. “We spend 90% of our time indoors, and 90% of the cost of a building are the occupants, yet indoor environmental quality and its impact on health and productivity are often an afterthought. These results suggest that even modest improvements to indoor environmental quality may have a profound impact on the decision-making performance of workers.”

Building-related illnesses, such as sick building syndrome, initially gained attention in the 1980s. In response, the healthy building movement is addressing issues such as indoor air quality and other aspects of the indoor environment.

Ventilation solutions reduce contaminant levels“Formaldehyde, mold, stale air: the best solution for indoor air pollution is dilution,” says Larry Ponziano, Midwest technical sales representative for Zehnder America. “Indoor air pollution is a sad but true fact in our world. I’ve seen it first-hand that [Zehnder heat recovery ventilators] have lowered the formaldehyde levels in the air by a factor of 10 and mold counts by a factor of 12.”

Zehnder heat recovery ventilators provide continuous ventilation and replace a third of the air volume in a space each hour with fresh, filtered air. As a balanced ventilation system, it supplies and exhausts an equal amount of air. The most energy-efficient heat recovery ventilation systems on the market, Zehnder systems capture heat from the exhaust air and transfer it to the intake air.

“Diluting sick air with fresh air is a great solution,” explains Ponziano. “Our systems also capture a high percentage of the energy that is otherwise dissipated in the atmosphere.”

Unlike in the 1980s, ventilation solutions exist that both dramatically improve indoor air quality and save energy. Although the energy savings may be easy to calculate, the advantages of being able to form effective strategies and respond to crises are priceless and can have a dramatic impact on a company’s bottom line.

Originally posted here


How to Improve Indoor Air Quality

Topics: IAQ