Fine/Respirable Particulate Matter (PM )
2.5
3
The 24-hour Canada-Wide Standard (CWS) for PM  is 30 µg/m .
2.5
Data from Monitoring Sites within Sarnia Area
TABLE 39
PM
2.5
Year
Station
Annual
Max 1h
Max. 24h
Number of  days
3
Arithmetic
Value
Value
above 30 µg/m
Mean
benchmark
2000
Moore Line
10
124
32
1
Centennial Park
9
95
35
3
2001
Moore Line
8
84
35
2
Centennial Park
9
268
42
8
2002
Moore Line
9
64
42
7
Note: value of  the CWS has been applied as a benchmark; the statistical requirements
to achieve the standard have not been applied.
Year 2001 levels of  PM  at the Centennial Park location
2.3.2
Selected Hazardous Air Pollutants
2.5
were similar to 2000, and lower at the Moore Line
location.  While the data are limited, there are indications
SLEA monitors several VOCs at two stations within the
that concentrations in excess of  the proposed 24-hour
Sarnia area.  The IAQAB asked SLEA to provide data
3
have occurred and will likely con-
CWS of  30 µg/m
for the VOCs which were identified in the ealier IJC
tinue.  PM  24-hour proposed (CWS) Canada-Wide
report of  1992 for their high levels of  concern relative
2.5
3
Standard: 30 µg/m  in year 2010.  2001 levels of  PM  at
to direct inhalation in the region including: 1,2-
2.5
the Centennial Park location were similar to year 2000,
Dichloroethane; 1,3-Butadiene; 1,4-Dichlorobenzene;
and lower at the Moore Line location.
benzene; carbon tetrachloride; chloroform; perchloroet-
hylene; and trichloroethylene.  All of  these VOCs would
be considered to present high levels of  concern relative
Lead
to the risks associated with direct inhalation under both
the Clean Air Act benchmark and the criteria used in the
At present, no data for lead monitoring in Sarnia have
earlier IJC report (1991).  It should be noted that the
been located.
calculated mean or average can vary depending on the
substitution number used when a sample is below the
minimum detention limit of  the equipment.
46