The short-term effects of air pollution on hospital admissions in four Australian cities.
BACKGROUND
This paper examines the short-term health effects of air pollution on daily hospital admissions in Australian cities (those considered comprise more than 50% of the Australian population) for the period 1996-99.


METHODS
The study used a similar protocol to overseas studies and derived single city and pooled estimates using different statistical approaches to assess the accuracy of the results.


RESULTS
There was little difference between the results derived from the different statistical approaches for cardiovascular admissions, while in those for respiratory admissions there were differences. For three of the four cities (for the other the results were positive but not significant), fine particles (measured by nephelometry - bsp) and nitrogen dioxide (NO2) have a significant impact on cardiovascular admissions (for total cardiac admissions, RR = 1.0856 for a one-unit increase in bsp (10(-4) x m(-1)), RR = 1.0023 for a 1 ppb increase in NO2). For three of the four cities (for the other, the results were negative and significant), fine particles, NO2 and ozone have a significant impact on respiratory admissions (for total elderly respiratory admissions, RR = 1.0552 per 1 unit (10(-4) x m(-1)) increase in bsp, RR = 1.0027 per 1ppb increase in NO2, RR = 10014 per 1 ppb increase in ozone for elderly asthma and COPD admissions). In all analyses the particle and NO2 impacts appear to be related.


CONCLUSIONS
Similar to overseas studies, air pollution has an impact on hospital admissions in Australian cities, but there can be significant differences between cities.
Faculty of Science, Health and Education, University of the Sunshine Coast, Queensland. rsimpson@usc.edu.au
Rod
R
Simpson
Gail
G
Williams
Anna
A
Petroeschevsky
Trudi
T
Best
Geoff
G
Morgan
Lyn
L
Denison
Andrea
A
Hinwood
Gerard
G
Neville
D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000393:Air Pollutants / Q000009:adverse effects* / Q000032:analysis; D001315:Australia / Q000453:epidemiology; D002318:Cardiovascular Diseases / Q000209:etiology*; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D008171:Lung Diseases / Q000209:etiology*; D008875:Middle Aged; D009585:Nitrogen Dioxide / Q000032:analysis; D010126:Ozone / Q000032:analysis; D014505:Urban Population
D000393:Air Pollutants; D010126:Ozone; D009585:Nitrogen Dioxide