influence of  TRS on the Air Quality Index as shown in
Total Reduced Sulphur (TRS)
Table 49.  A TRS emissions inventory for Algoma Steel
Inc. is not available at this time for the review period and
The annual mean concentrations of  TRS show a decline
hence it is difficult to compare air quality improvements
during the 1990s.  The number of  episodes with hourly
with emission reductions.  However, one can assume
averages exceeding the pulp mill objective of  27 ppb has
that the process improvements undertaken at that
been sporadic with a total of 11 hours during the entire
facility in the 1990s to reduce overall air contaminant
period, 1990-2001.  The decline in TRS concentrations is
emissions has resulted in reduced TRS releases.
in parallel with a decline in the number of  hours of
moderate to poor air quality since 1998 indicating the
TABLE 49
Three-year Summary for Total Reduced Sulphur in Sault Ste. Marie, Ontario
TRS 1-hour Ontario MOE AAQC is 27 ppb
Station
1998
1999
2000
Number
Number
Number
of hours
of hours
of hours
above
1hr-
24h-
above
1hr-
24h-
above
1hr-
24h-
AAQC
max
max
AAQC
max
max
AAQC
max
max
Patrick St.
Merrifield
3
37
4.1
0
25
4.8
0
13
3.2
School
The number of  recorded hours above the provincial 1-
Ground Level Ozone
hour objective of  80 ppb was highest in 1996, 1998 and
1999, again supporting the observation of  generally
The annual means ranged between 22 to 25 ppb, which
higher ozone concentrations in the second half of the
is typical for northern Ontario and which is about five
decade.  During this period, the increased influence of
ppb greater than in southern Ontario.  The four highest
ozone on the occurrence of  moderate-to-poor air
annual means of  the review period were observed in the
quality is also evident.  This trend moderated in the
last five years, possibly suggesting a trend of  increasing
latter part of  the decade, likely largely due to meteoro-
ozone levels at that site during this latter period.
logical factors.
TABLE 50
Three-year Summary for Ozone Maximum 1-hour and 24-hour levels  in Sault Ste. Marie, Ontario
O  1-hour Ontario MOE AAQC is 80 ppb
3
Station
1998
1999
2000
Number
Number
Number
of hours
of hours
of hours
above
1hr-
24h-
above
1hr-
24h-
above
1hr-
24h-
AAQC
max
max
AAQC
max
max
AAQC
max
max
Patrick St.
Merrifield
10
98
61.5
8
88
68
1
82
65.7
School
56