Air pollution, weather, and respiratory emergency room visits in two northern New England cities: An ecological time-series study

  • Wilson A
  • Wake C
  • Kelly T
 et al. 
  • 43

    Readers

    Mendeley users who have this article in their library.
  • 62

    Citations

    Citations of this article.

Abstract

Daily emergency room (ER) visits for all respiratory (ICD-9 460-519) and asthma (ICD-9 493) were compared with daily sulfur dioxide (SO2), ozone (O3), and weather variables over the period 1998-2000 in Portland, Maine (population 248,000), and 1996-2000 in Manchester, New Hampshire (population 176,000). Seasonal variability was removed from all variables using nonparametric smoothed function (LOESS) of day of study. Generalized additive models were used to estimate the effect of elevated levels of pollutants on ER visits. Relative risks of pollutants are reported over their interquartile range (IQR, the 75th -25th percentile pollutant values). In Portland, an IQR increase in SO2was associated with a 5% (95% CI 2-7%) increase in all respiratory ER visits and a 6% (95% CI 1-12%) increase in asthma visits. An IQR increase in O3was associated with a 5% (95% CI 1-10%) increase in Portland asthmatic ER visits. No significant associations were found in Manchester, New Hampshire, possibly due to statistical limitations of analyzing a smaller population. The absence of statistical evidence for a relationship should not be used as evidence of no relationship. This analysis reveals that, on a daily basis, elevated SO2and O3have a significant impact on public health in Portland, Maine. © 2004 Elsevier Inc. All rights reserved.

Author-supplied keywords

  • Air pollution
  • Asthma
  • Emergency room
  • Respiratory
  • Time-series

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • Adam M. Wilson

  • Cameron P. Wake

  • Tom Kelly

  • Jeffrey C. Salloway

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free