TABLE 15
A 3-Year Summary for 1-hour and 24-hour Maximum Concentration for NO  (in ppb)
2
NO  1-hour AAQC is 200 ppb; NO  24-hour AAQC is 100 ppb
2
2
Station
1998
1999
2000
(A)
(B)
(C)
(A)
(B)
(C)
(A)
(B)
(C)
Windsor
Downtown
(University)
23.8
46.0
117
22.9
49.5
90
21.6
44.7
104
Windsor-
Tecumseh
Water Treatment
Plant (Riverside)
No data
14.1
40.3
85
16.0
39.6
73
Windsor West
(College)
No data
No data
INS*
41.5
61
(A) Annual Mean
(B) 24-hour max
(C) 1-hour max
INS*  insufficient data
Additional ambient data from the Ontario MOE
Nitrogen Oxides (NOx)
indicates a reduction in NOx concentrations.  Based
No provincial AAQC
on Ministry data, the annual mean for NOx has
(NOx included for consideration as NOx is an important
declined between the years 1991 (annual mean -
precursor to ozone formation.  NOx measurement is not used in
the AQI)
42.0ppb) and 2000 (annual mean - 36.0).
The Ontario Ministry of  the Environment NOx (a
Total Reduced Sulphur (TRS)
mixture of  NO and NO ) emissions inventory for point
2
sources in Windsor shows increasing levels throughout
The annual mean concentrations of  TRS at the Windsor
most of  the reporting period (1990-2001), largely due to
West (College St. site) were variable during the 1990s,
an increase in the number of  sources reporting their
ranging from 0.7 to 1.6  ppb.  The variability was more
emissions.  Thus, although the inventory shows an
pronounced in the second half of the review period.
increase in emissions, it maybe due to the improvements
gained in reporting mechanisms and not reflect an
Exceedances of  the 1-hour AAQC at the Windsor West
increase in actual emissions from point sources.  (This
(College St.) appear to be increasing over time.  Averages
observation is based on point and areal source emissions
exceeded the provincial objective of  27 ppb over one
inventory only and does not include emissions from
hour for 102 hours between 1991-2000.  Maximum
mobile sources, a major contributor to NOx.)
hourly readings during that time were four to five times
the objective as shown in the following summary chart.
TABLE 16
A 3-Year Summary of  Number of  Exceedances and Maximum 1-hour and 24-hour
concentrations for Total Reduced Sulphur
TRS 1-hour AAQC is 27 ppb
Station
1998
1999
2000
(A)
(B)
(C)
(A)
(B)
(C)
(A)
(B)
(C)
Wright/ Water
1
346.5
12
54
13.5
12
43
11.3
Windsor West
28
132
14.2
1
305.0
26
101
19.3
(College)
(A) Number of  hours above AAQC
(B) 1-hour max (ppb)
(C) 24-hour max (ppb)
23