Abstract
Purpose
8% of the US population has asthma. Air pollution is linked to exacerbation in susceptible individuals. The objective was to identify air pollutants that increased the risk of asthma emergency department visits during a time wherein a polluting factory was criminally convicted, changing local air pollutant levels.
Methods
An ecological time-series design used a daily count of asthma emergency visits from 2007 to 2012 as the dependent variable. Independent variables air pollutants (NO2, PM2.5 CO, and O3), controlling for meteorological conditions, were analyzed using time-series and Poisson GLM models.
Results
76,651 emergency asthma visits were included with an average of 35 visits per day (SD = 9.2, range 11–80) in a stationary time series. Increased visit volume in fall and spring had no associations to the air pollutants. Associations between individual air pollutants occurred in otherwise low-volume months for asthma emergency visits. The strongest relationship was an 11.6% increase in the asthma emergency visit rate during the month of June. In monthly groupings that removed most of the autumn and spring months, O3, PM2.5, CO, and NO2 were associated with 5, 4, 2, and 2% increases in asthma emergency visits, respectively. CO was the only pollutant with a negative association with asthma emergency visits, occurring in the month of April.
Conclusions
Pollutants NO2, PM2.5 CO, and O3 were associated with increased emergency asthma visits in some, but not all months of the year. Air pollution’s impact on asthma emergencies may be masked by other, more influential seasonal triggers, such as infections or allergies.
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Acknowledgements
This study was funded by the University at Buffalo’s Civic Engagement and Public Policy Dissemination Fellowship grant and the Patricia H. Garman Behavioral Health Nursing Endowment at the University at Buffalo School of Nursing. This study was performed in partial fulfillment of Dr. Caster’s role as lead investigator, with anticipated support from, the Environmental Health Study of Western New York (also documented as The Tonawanda Health Study: An Epidemiologic Study of Health Effects and Coke Oven Emissions from Tonawanda Coke). The authors gratefully acknowledge our community partners, IT support, and Drs. Tarunraj Singh and Robert Baier, as well as students and research assistants Souransu Nandi, Ziqiang Chen, Wolf Wackeroth, Nan Nan, Harish Mangalampalli and Angad Gadre.
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JC and YY contributed to the concept, design and analysis of the data. LG contributed to the analysis and interpretation of the data. JC drafted the paper and all authors contributed to the revision and final approval.
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Relevant ethical approval was obtained from the New York State Data Protection Review Board (#1403-05) and the University at Buffalo’s Institutional Review Board.
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Dr. Yin and Mr. Guo declare no conflict of interest. Dr. Castner’s research has been funded by grants from The Rockefeller University Heilbrunn Family Center for Nursing Research, NSF (#1737617, #1645090), The Ohio State University, University at Buffalo, and had been committed support by the University at Buffalo through NIH (#1U54TR001358). Dr. Castner has received support from the Emergency Nursing Association/Journal of Emergency Nursing for teaching, speaking honoraria, and editor/editorial board travel. Dr. Castner has had a research/data analysis consulting relationship with the Harvard T. H. Chan School of Public Health, American Lung Association, and hospitals in the region of study, with additional funding/consulting disclosures which are unlikely to be perceived as a conflict of interest available on request.
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Castner, J., Guo, L. & Yin, Y. Ambient air pollution and emergency department visits for asthma in Erie County, New York 2007–2012. Int Arch Occup Environ Health 91, 205–214 (2018). https://doi.org/10.1007/s00420-017-1270-7
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DOI: https://doi.org/10.1007/s00420-017-1270-7