Skip to main content

Better air in classrooms matters beyond COVID

By April 6th, 2022Blog

Here’s why schools aren’t there yet


Not many people can say the pandemic has made their jobs easier. But in some ways, Tracy Enger can.

“You know, it is such a hallelujah moment, absolutely,” says Enger, who works at the Environmental Protection Agency’s Indoor Environments Division. For more than 25 years, she’s been fighting to improve the air quality inside of America’s schools.

But there are lots of competing demands for limited school budgets. And in the past, getting school districts to prioritize indoor air quality hasn’t been easy. Often, she says, it took some kind of crisis to get schools to focus on the issue – “when they found the mold problem, when their asthma rates were kind of going through the roof.”

Then came the COVID-19 pandemic — spread by virus particles that can build up in indoor air and linger, sometimes for hours. Key to clearing out those infectious particles: good ventilation and filtration. For example, one study of Georgia schools linked improved ventilation strategies, combined with HEPA filtration, to a 48 percent lower rate of COVID.

Suddenly – finally – lots of people have started to pay attention to indoor air quality in schools, says Anisa Heming, director of the Center for Green Schools at the U.S. Green Building Council.

“It matters more to people right now,” says Heming. “COVID is this immediate threat that has made air quality immediately relevant.”

That’s why she and other indoor air-quality experts say the Biden administration’s new National COVID-19 Preparedness Plan is a step in the right direction: It specifically highlights the need to help schools upgrade their ventilation systems for the long term, using funding from the American Rescue Plan Act.

Healthy Buildings Program

Heming says in the past, it’s been hard to make a health case for improving air quality in schools, because the health impacts tend to be longer term. But a whole body of research shows the health and academic benefits are substantial – and go beyond COVID. When a room is better ventilated, influenza rates, asthma attacks and absenteeism go down, reading and math test scores go up. Less carbon dioxide builds up in a room, which helps students think more clearly.

“It’s well documented across all different countries and all different ages,” says Joseph Allen, director of the Healthy Buildings program at Harvard University. “We see benefits in kindergarteners, we see benefits in high school, we see benefits in college students and middle schoolers – every age group.”

Allen says understanding these long-term benefits of upgrading ventilation is vital, “because an investment right now is not just a short-term investment for COVID. If a school does this right, they can expect not only years, but decades of benefits to health beyond reductions in infectious disease transmission.”

And experts say those investments are desperately needed, because most U.S. schools are poorly ventilated to begin with. The average American school is over 45 years old, and many have HVAC systems that are outdated or need repairs, according to a 2020 report from the Government Accountability Office. Some schools are so old, they don’t even have mechanical ventilation systems.

“I don’t think a lot of people recognize that the design standards [that govern ventilation rates in schools and other buildings] are bare minimums. They were never actually set for health,” says Allen.

How good is the maintenance of schools ventilation?

Carl Thurnau knows all too well just how bad deferred school maintenance can get. Several years ago, a classroom ceiling actually collapsed at a school in the City School District of New Rochelle, New York. That’s when the district recruited Thurnau, an engineer, to become its director of facilities to oversee a $106 million overhaul of buildings – a process that was already funded and in motion when COVID struck. That money meant the school district could quickly pivot to implement ventilation upgrades in response to COVID.

Having funding in place “is why we were able to get ahead of this – and in my opinion, stay ahead,” Thurnau says. But “there’s no doubt that districts with less financial resources are struggling to find the money to solve some of these problems.”

Ventilation and green building experts have been offering schools guidance on how to improve their air quality to reduce COVID risk since the early days of the pandemic, even before the Centers for Disease Control and Prevention acknowledged the virus could spread through the air. Broadly speaking, Allen says, the advice boils down to three major things: increasing the amount of outdoor air in a classroom; using higher-efficiency MERV filters in HVAC systems; and supplementing these measures with portable air cleaners with HEPA filters.



Acoustica Australia is able to provide a qualified and professional assistance to achieve effective ventilation for classrooms.

Our aim is to use this blog for sharing relevant information. Together we know more and we can achieve more.


Leave a Reply

Close Menu

Not sure which Acoustica product is right for you?

Product Selector