"Change in percentage of hospitalizations attributable to short-term exposure to ground-level ozone by region, Canada, 1996 to 2018",,,,,, ,,,,,, Years (7-year periods),"Risk of hospitalizations attributable to ground-level ozone (percentage) ",Change in percentage of hospitalizations attributable to ground-level ozone (change from first 7-year period),"Risk of hospitalizations attributable to ground-level ozone (percentage) ",Change in percentage of hospitalizations attributable to ground-level ozone (change from first 7-year period),"Risk of hospitalizations attributable to ground-level ozone (percentage) ",Change in percentage of hospitalizations attributable to ground-level ozone (change from first 7-year period) Region,Eastern Canada,Eastern Canada,Central Canada,Central Canada,Western Canada,Western Canada 1996 to 2002,-0.32[A],0,-0.39[A],0,0.69,0 1997 to 2003,-0.24[A],0.08,-0.37[A],0.02,-0.03[A],-0.72 1998 to 2004,-0.06[A],0.26,-0.37[A],0.02,0.05,-0.64 1999 to 2005,-0.25[A],0.08,-0.08[A],0.31,-0.07[A],-0.77 2000 to 2006,0.62,0.94,-0.22[A],0.17,0.13,-0.56 2001 to 2007,1.01,1.34,0.34,0.74,0.99,0.3 2002 to 2008,1.72,2.04,0.87,1.26,0.9,0.21 2003 to 2009,1.78,2.1,1.12,1.52,0.91,0.22 2004 to 2010,1.49,1.82,2.09,2.49,0.91,0.22 2005 to 2011,1.64,1.96,1.4,1.8,0.89,0.2 2006 to 2012,1.62,1.94,0.56,0.95,1.69,1 2007 to 2013,1.31,1.63,0.46,0.86,1.63,0.94 2008 to 2014,2.81,3.13,-0.36[A],0.04,2.47,1.78 2009 to 2015,2.43,2.75,-0.14[A],0.25,3.33,2.64 2010 to 2016,1.86,2.19,-0.19[A],0.21,2.35,1.66 2011 to 2017,0.62,0.94,0.57,0.96,2.47,1.78 2012 to 2018,0.41,0.74,0.53,0.92,2.29,1.6 ,,,,,, "Note: [A] It is not uncommon and expected for epidemiologic studies on the impacts of air pollution on health to produce negative estimates for some periods either by chance or due to background change. The indicator reports estimates of the percentage of hospitalizations attributable to short-term exposure to O3 over 7-year periods and shows differences in the estimates relative to the respective reference period (first 7-year period). A total of 84 communities were analyzed for the regional indicator for O3, covering 78% of the Canadian population. The Eastern Canada (Newfoundland and Labrador, Nova Scotia, New Brunswick, and Quebec) region is composed of 32 communities (covering 18% of the Canadian population); Central Canada (Ontario) has 31 communities (covering 35% of the Canadian population); and Western Canada (Manitoba, Saskatchewan, Alberta, and British Columbia) has 21 communities (covering 25% of the Canadian population). In order to determine trends, 7-year periods were used to avoid abnormally high or low estimates due to data availability. For more information, please consult the Methods section (www.canada.ca/en/environment-climate-change/services/environmental-indicators/air-health-trends.html#methods). ",,,,,, "Source: Health Canada (2022) Environmental Health Science and Research Bureau, Population Studies Division.",,,,,, Available on the Environmental indicators website (www.canada.ca/environmental-indicators).,,,,,,