Science-based pollen forecasts could reduce asthma-related emergency room visits by alerting vulnerable individuals to high pollen days.
RT’s Three Key Takeaways:
- Pollen and Asthma ER Visits: The study found that while overall pollen accounts for a small percentage of asthma-related ER visits annually, during peak pollen times, up to 20% of such visits can be attributed to pollen.
- Importance of Local Pollen Knowledge: Understanding which local plants produce allergenic pollen can help in developing accurate, science-based pollen forecasts to warn vulnerable individuals.
- Preventative Measures: Reliable pollen forecasts could enable asthma patients to take preventative measures, such as staying indoors or taking allergy medications, to reduce the risk of asthma attacks triggered by high pollen levels.
A new Cornell University study that tracks how many asthma-related emergency room (ER) visits result from pollen in metropolitan areas highlights the importance of knowing local plants and the need for developing science-based pollen forecasts.
Such forecasts could alert vulnerable individuals on days when they should consider staying indoors or taking allergy medications ahead of time.
“Even though the percent of asthma-related emergency department visits associated with pollen overall was only a few percent on an annual basis, at certain times of year when particular types of pollen were spiking, we sometimes saw up to almost 20% of visits were due to pollen,” says Daniel Katz, assistant professor and first author of the study.
Research Data and Analysis
To figure out which asthma emergencies may have been activated by pollen, as opposed to a virus or other cause, the researchers collected data from the Texas Department of State Health Services and analyzed close to 175,000 asthma-related ER visits between 2015 and 2020. They singled out visits from patients who lived within about 15 miles of one of eight pollen monitoring stations where airborne pollen concentrations are measured.
When pollen and virus prevalence were high at the same time, the researchers had the advantage of an abundance of data, from eight cities and over five years, to uncover the likely causes.
“Sometimes the timing of when viruses were prevalent changed,” Katz says in a release, “and sometimes the timing of when pollen was in the air changed. So, because of this natural variability, we were able to better untangle what was contributing to these asthma-related emergency department visits.”
Regional Pollen Variability
The researchers chose cities for the study based on their proximity to Central Texas, where a species of tree, Ashe juniper (Juniperus ashei), one of the most important allergenic pollen-producing trees, is prevalent. Some cities were in the middle of these pollen hot spots and others were far from them.
“We ended up finding that some of the cities had these spikes in asthma-related emergency department visits in January, when that species releases its pollen, whereas cities outside its primary range did not have corresponding spikes,” Katz says in a release. Still, he says, various pollen is in the air for most of the year in Texas, creating challenges for people with asthma.
Future Directions and Applications
The study helps inform Katz’s ongoing work to develop publicly available pollen forecasts that incorporate remote sensing and atmospheric dispersion and plant ecology.
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