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 )
Effects
3
Irritates the human lung and can make breathing
Formed
difficult
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
3
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.
Sources
See sources of  nitrogen oxide and VOCs
Standards/Criteria
TABLE 2
Standards (Michigan) / Guidelines (Ontario) for Ozone
Michigan (U.S. EPA NAAQS)
Pollutant
Primary Standard (Health Related)
Secondary Standard
1-hour
0.12 ppm
O
3
3
)
Same as Primary Standard
The area is in compliance with the standard when the
(235µg/m
3-year average of  the expected number of   exceedance
days per calendar year is equal to or less than one
Pending 8-hour
0.08 ppm
Same as Primary
3
(157µg/m )
Standard
The standard would be met when the 3-year
th
average of  the 4  highest daily maximum 8-hour
concentration is less than or equal to 0.08 ppm
Ontario (MOE)
Pollutant
Criteria
1-hour
0.080 ppm
O
3
AAQC
8-hour averaging time, achievement to be based on the 4th highest
65 ppb
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
7