TABLE 40 (cont’d)
Ambient Air Monitoring Data for Selected Hazardous Air Pollutants in Sarnia
Chemical
Year
FRONT STREET
RIVER BEND
24-hour Max
Mean
24-hour Max
Mean
3
3
3
3
µg/m
µg/m
µg/m
µg/m
Carbon tetrachloride
1995
1.7
0.93
0.9
0.7
(24h MOE AAQC is
1996
1.6
0.8
1.1
0.7
3
65 µg/m )
1997
2.0
0.9
1.0
0.6
US Clean Air Act Lifetime
1998
1.9
0.7
5.0
1.0
Benchmark concentration
1999
1.8
0.7
1.6
0.6
3
*
2000
3.5
0.99
5.2
0.7
0.07 µg/m
2001
4.1
0.92
8.9
1.2
2002
1.5
0.48
1.2
0.6
Chloroform (Interim 24h
1995
0.2
0.1
0.2
0.1
3
MOE AAQC is 1 µg/m )
1996
0.3
0.1
0.1
0.1
1997
0.3
0.1
0.1
0.1
1998
0.4
0.1
3.7
0.2
1999
0.2
0.1
0.2
0.1
2000
0.5
0.2
0.6
0.2
2001
0.8
0.1
0.9
0.1
2002
0.2
0.0
0.4
0.0
Percholoroethylene
1995
1.1
0.3
5.6
0.5
(Interim 24h MOE AAQC is
1996
1.6
0.3
6.9
0.9
3
)
1997
3.0
0.4
7.4
1.0
30 µg/m
1998
2.9
0.4
1.2
0.3
1999
3.0
0.3
2.1
0.4
2000
1.2
0.3
4.7
0.8
2001
1.1
0.2
6.9
1.1
2002
2.5
0.3
4.3
0.6
Trichloroethylene
1995
0.2
0.0
0.3
0.0
(Interim 24h MOE AAQC is
1996
0.4
0.1
0.2
0.0
3
115 µg/m )
1997
0.8
0.1
0.4
0.0
1998
0.4
0.1
5.6
0.2
1999
0.8
0.0
0.5
0.0
2000
0.9
0.2
5.2
0.3
2001
1.1
0.2
1.9
0.3
2002
0.4
0.1
1.1
0.1
*NOTE: the U.S. Clean Air Act Lifetime Benchmark is the air concentration at which a continuous life-time of
exposure could result in a calculated risk of  development of  cancer in no more than one in one million of  the
exposed population.  As the extent of  exposure in the Sarnia setting does not meet these conditions, use of  this
benchmark as a direct comparison to ambient concentrations is inappropriate.  It is included as indicative of  one of
the more conservative guidelines for exposure to the given contaminant in current legislation.
48