TABLE 35
Summary of  Three Years Data for Ozone (O ) for the MOE Centennial Park Station
3
1-hr AAQC (80 ppb)
1998
1999
2000
Number of
1h-Max
24h-Max
Number of
1h-Max
24h-Max
Number of
1h-Max
24h-Max
  times above
times above
times above
  1h AAQC
1h AAQC
1h AAQC
106
125
75.5
85
145
67.5
15
107
61.3
The number of  times the 1-hour AAQC was exceeded
TABLE 36
Summary Chart of  Annual Mean
was reduced dramatically over the years from 106
and 1-hour Maximum NO
2
incidences during 1998 to only 15 in the year 2000.
Concentrations for Two Sites
However, partial data indicate that the one-hour AAQC
in Sarnia (in ppb)
(80 ppb) was exceeded 93 hours in 2001 and 111 hours
1-hour AAQC is 200 ppb;
in 2002.  These results should be compared with meteo-
24-hour AAQC is 100 ppb
rological conditions to determine their influence on
these outcomes.
Location
Front St.
River Bend
Year
Mean
Max 1h
Mean
Max 1h
1990
17
86
12
82
Nitrogen Dioxide (NO )
2
1991
20
105
10
58
In 2001, NO  continued a recent and unexplained
1992
20
79
12
78
2
upward climb in concentration levels; this chart displays
1993
21
109
10
92
the annual average.  However, the tabular data summary
1994
17
84
12
72
(Table 36) indicates that neither the 24-hour AAQC
1995
14
77
11
58
(100 ppb) nor the 1hour AAQC (200 ppb) were ex-
1996
12
100
11
61
ceeded in the period from 1990-2002 at the two moni-
toring sites in the Sarnia region (Front St. and River
1997
10
71
11
64
Bend sites).
1998
12
84
11
100
1999
13
92
10
79
2000
15
84
10
56
2001
18
70
10
63
2002
17
14
10
65
44