Abstract
Background
Prescribed agricultural burning is a common land management practice, but little is known about the health effects from the resulting smoke exposure.
Objective
To examine the association between smoke from prescribed burning and cardiorespiratory outcomes in the U.S. state of Kansas.
Methods
We analyzed a zip code-level, daily time series of primary cardiorespiratory emergency department (ED) visits for February–May (months when prescribed burning is common in Kansas) in the years 2009–2011 (n = 109,220). Given limited monitoring data, we formulated a measure of smoke exposure using non-traditional datasets, including fire radiative power and locational attributes from remote sensing data sources. We then assigned a population-weighted potential smoke impact factor (PSIF) to each zip code, based on fire intensity, smoke transport, and fire proximity. We used Poisson generalized linear models to estimate the association between PSIF on the same day and in the past 3 days and asthma, respiratory including asthma, and cardiovascular ED visits.
Results
During the study period, prescribed burning took place on approximately 8 million acres in Kansas. Same-day PSIF was associated with a 7% increase in the rate of asthma ED visits when adjusting for month, year, zip code, meteorology, day of week, holidays, and correlation within zip codes (rate ratio [RR]: 1.07; 95% confidence interval [CI]: 1.01, 1.13). Same-day PSIF was not associated with a combined outcome of respiratory ED visits (RR [95% CI]: 0.99 [0.97, 1.02]), or cardiovascular ED visits (RR [95% CI]: 1.01 [0.98, 1.04]). There was no consistent association between PSIF during the past 3 days and any of the outcomes.
Significance
These results suggest an association between smoke exposure and asthma ED visits on the same day. Elucidating these associations will help guide public health programs that address population-level exposure to smoke from prescribed burning.
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Data availability
The computing code can be obtained by contacting the corresponding author. The data are not available because they include medical information that cannot be released.
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Acknowledgements
The authors thank Dr. Mitchel Klein for his assistance with the SAS programming for this analysis. The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention. This publication was supported by the Kansas Environmental Public Health Tracking Program through Cooperative Agreement Number NUE1EH001340-01 funded by the Centers for Disease Control and Prevention. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the Centers for Disease Control and Prevention or the Department of Health and Human Services.
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FY, FA, and KS conceived of the work. AP, AV, AM, MM, KS, and WDF contributed to study design. FA obtained the health data. AV and AM developed the exposure estimate. AP and WDF completed the analysis. AP and AV drafted the manuscript. All authors contributed to the interpretation of results and to the revision of the manuscript.
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The authors declare they have no competing financial interests. Dr. Flanders discloses that he owns a consulting company, Epidemiologic Research & Methods, LLC that does consulting work for clients. He knows of no conflicts with this work.
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This activity was reviewed by the Centers for Disease Control and Prevention (CDC) and was conducted consistent with applicable federal law and CDC (See e.g., 45 C.F.R. part 46, 21 C.F.R. part 56; 42 U.S.C. §241(d); 5 U.S.C. §552a; 44 U.S.C. §3501 et seq.).
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Pennington, A.F., Vaidyanathan, A., Ahmed, F.S. et al. Large-scale agricultural burning and cardiorespiratory emergency department visits in the U.S. state of Kansas. J Expo Sci Environ Epidemiol 33, 663–669 (2023). https://doi.org/10.1038/s41370-023-00531-3
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DOI: https://doi.org/10.1038/s41370-023-00531-3