An epidemic of absenteeism
During the 2022–23 school year, over a third of Colorado K-12 students were chronically absent—
defined as missing 10% of the school days in a year. That’s up from
one in five students before the pandemic. Students are absent from school for a myriad of reasons—bullying, transportation problems and financial hardship—and asthma stands out as the leading cause of absenteeism due to chronic illness.
Funded by Colorado’s Ryan Innovation Fund, Hernandez started testing air purifiers in Denver Public School (DPS) classrooms in 2020, in an effort to help reopen schools under
better conditions during the pandemic.
“When the pandemic broke out, there were a lot of people introducing air purifiers in classrooms. But many of the purifiers weren't sized correctly, didn’t work well or were too loud. No one had systematically assessed the purifiers’ performance in actual educational settings at this scale” Hernandez said.
In 2021, Hernandez and his team
installed air purifiers coupled with air quality monitors in 20 public elementary school buildings with funding from the Intel Corporation and the Carrier Company. Most of the schools are located along the I-25 and I-70 highways, and their proximity to high-traffic corridors and industrial zones increases students’ exposure to air pollution, which could worsen the effects of COVID-19. In some of these schools, more than 20% of the students have asthma.
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An inexpensive, but powerful solution
Hernandez estimates that effectively reducing airborne particles in indoor air pollution with air purifiers would cost $65 per student, per classroom, per year.
“Installing a couple of air purifiers in a classroom is cheaper than a textbook, but schools are always strapped for money. Now we have data that shows these commonly available appliances, which don’t disrupt teaching, can be systematically prioritized. It’s well worth it in both the immediate and long term,” Hernandez said.
The project has a huge community and educational impact, Hernandez added. He is proud of the students and contractors who worked day and night to install the air monitors in thousands of classrooms over the past summer. Many of the young researchers working on the project are first-generation college students who come from communities disproportionately affected by air pollution and COVID-19.
Studies have found that Black and Hispanic students have the highest asthma rates in the U.S.
Can air purifiers help keep kids in school? New study seeks to find out (University of Colorado, Boulder, Sep 27, 2023)