TABLE 18
A 3-Year Summary of  1-hour and 24-hour Maximum Ozone Concentration
and Number of  Exceedances Above the 1-hour AAQC
O  1-hour AAQC is 80 ppb
3
Station
1998
1999
2000
(A)
(B)
(C)
(A)
(B)
(C)
(A)
(B)
(C)
Windsor Downtown
(University)
87
123
81.9
106
112
76.9
22
103
61.4
Windsor West
51
113
64.9
79
129
66.8
13
106
59.3
(College)
(A) Number of  hours above AAQC
(B) 1-hour max (ppb)
(C) 24-hour max (ppb)
Carbon Monoxide (CO)
Coarse/Inhalable
Particulate Matter (PM )
10
A significant decrease in annual concentrations at the
Windsor Downtown site (University Ave) is evident; a
Three sites in Windsor monitored PM .  The annual
10
similar trend is evident across the province.  These
3
means varied from 20 to 32 µg/m  which is in the upper
reductions are attributed to reduced emissions from the
range of  the measurements recorded in the province.
transportation sector which account for about 66
Overall, the levels were higher at the Wyandotte St., (an
percent of  the provincial CO emissions.  Annual mean
3
industrial site,) by about 2 µg/m .  The means at that site
carbon monoxide concentrations at this site appear to be
peaked in 1994 and showed a decreasing trend for the
stabilizing at just over 0.2 ppm in the last few years of
remainder of  the decade.  The other sites show more
the review period.  The 1-hour and 8-hour objectives
variability and no obvious temporal pattern.
were not exceeded during this period.
3
The interim 24 hour objective of  50 µg/m , adopted by
TABLE 19
10-year Annual Trend for CO Annual
the Ontario MOE in 1997, was exceeded for 14 percent
Mean (ppm) for Windsor-Downtown
of  the samples collected at the Wyandotte St. site,
whereas 7.5 percent of  the samples were in non-
Year
Station
conformance at the University Ave. and Wright Ave.
Windsor-Downtown
sites.
1991
1.0
1992
0.9
In mid-1996, measurements of  PM  were taken at the
10
1993
0.8
Windsor West (College St. site) with a TEOM analyzer.
1994
1.0
The annual means of  the 24-hour measurement varied
1995
0.9
3
from about 24 to over 28 µg/m .  Both the annual
1996
0.8
1997
0.6
means and the number of  daily averages greater than the
1998
0.7
3
interim objective of  50 µg/m  were higher in 1997 and
1999
0.6
1998.  Observed maximum hourly averages and 24-hour
2000
0.3
3
3
and 127 µg/m ,
averages were as high as 349 µg/m
respectively.
Long range transport of  NOx and SO  (precursors to
2
PM ) from the mid-western U.S. contributes to the
10
PM  levels in southwestern Ontario (Ref. 29).
10
25