The impact of 9/11 on the association of ambient air pollution with daily respiratory hospital admissions in a Canada‐US border city, Windsor, Ontario

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Abstract
The 11 September 2001 (9/11) terrorist attacks in the United States resulted in long lines of trucks at the border crossing in Windsor, Ontario. Public concern about the potential impact of these trucks spewing toxic pollutants into the air drew attention to the need to investigate the impact of 9/11 on the daily levels of air pollutants and respiratory hospitalization. In this study, significant increases in respiratory admissions were found one month and 6 months post‐9/11. Mean daily respiratory admission was also significantly higher than the same period one year earlier and one year later. SO2 and CO concentration levels were found to be generally higher after 9/11 than one year before and immediately before. Relative risk estimates of respiratory hospitalization after 9/11 showed that SO2 ( = 1.15 for two‐day, = 1.18 for three‐day, and = 1.21 for five‐day averages), NO2 ( = 1.10 for current day), and COH ( = 1.09 for current day, = 1.10 for two‐day average) had the most significant effects after 9/11. These results suggest the need for more stringent regulatory efforts in air quality in the region in response to the changing transportation dynamics at this Canada‐US border crossing.