Canadian Environmental Sustainability Indicators

The metric of the annual standard is defined as the 3-year average of the annual average concentrations. [...] The metric of the 24-hour standard is defined as the 3-year average of the annual 98th percentile of the daily 24-hour average concentrations. [...] The metric of the standard is defined as the 3-year average of the annual 4th-highest daily maximum 8-hour average concentrations. [...] The horizontal dashed line represents the value of the 8-hour standard of the 2015 Canadian Ambient Air Quality Standards. [...] Since 2000, the annual peak concentrations of O3 were below the 2015 Standard for the Prairies and northern Ontario region, British Columbia and Atlantic Canada, with the exception of Atlantic Canada in 2001.