also found in Table 1. Where available, the CCME
Air Quality Criteria (AAQC) for Ontario are listed in
Canada-Wide Standard is also provided.
Table 1. Environment Canada provides a Maximum
Acceptable level for many of these pollutants which is
also provided in the table. The Canadian Council of the
Agencies often provide their standards in different units
of measurement, which can make direct comparison of
Ministers of the Environment (CCME) publishes a
compilation of Canadian Environmental Quality
various standards, objectives, and criteria difficult.
Table 1 attempts to provide each standard in a common
Guidelines which is intended to serve as the national
benchmark for many air pollutants; these guidelines are
unit of measurement where possible.
Ground Level Ozone (O )
Irritates the human lung and can make breathing
There are no significant point, area or mobile
Health Canada found an association between
sources of ozone. Rather, it is a pollutant formed
hospital admissions for respiratory distress and
under sunny conditions by the reaction between
. It is estimated that
increased ambient levels of O
oxides of nitrogen (NOx ) and volatile organic
for every 10 ppb increase in the 1-hour maximum
compounds (VOCs). Its occurrence is more
ozone level, a one percent increase in hospital
prevalent during summer months.
admissions and a 0.6 percent increase in mortality
Levels of ozone often follow a trend based on the
results (Ref. 4).
amount of available sunlight and the patterns of
A principal contributor to smog
rush hour traffic, particularly morning traffic.
Responsible for crop damage and accelerated
deterioration of rubber, dyes, paints and fabrics.
See sources of nitrogen oxide and VOCs
Standards (Michigan) / Guidelines (Ontario) for Ozone
Michigan (U.S. EPA NAAQS)
Primary Standard (Health Related)
Same as Primary Standard
The area is in compliance with the standard when the
3-year average of the expected number of exceedance
days per calendar year is equal to or less than one
Same as Primary
The standard would be met when the 3-year
average of the 4 highest daily maximum 8-hour
concentration is less than or equal to 0.08 ppm
8-hour averaging time, achievement to be based on the 4th highest
annual ambient measurement average over three consecutive yrs.
The Province of Ontario will adhere to the Canada-
Wide Standard - to be achieved by the year 2010
See Note next page