2.4
Port Huron
Sulphur Dioxide
2.4.1
Criteria (Common) Air Pollutants
In 2001, Port Huronís monitoring station shared the
average of  0.007 ppm in the state
highest annual SO
2
with the W. Fort St. site in Detroit.  The highest 24-hour
Air quality monitoring in Port Huron, MI, is limited to
concentration of  0.06 ppm, measured at the Port Huron
one station at Dove Rd. which monitors ozone, fine
site, while still below the 24-hour NAAQS of  0.14 ppm,
particulate matter (PM ), and sulphur dioxide (SO ).  As
2.5
2
is also the highest in the state.  Although the secondary
mentioned, the Michigan DEQ considers Port Huron as
NAAQS of  0.50 ppm over three hours was not ex-
part of  the Greater Detroit PMSA.
ceeded, the Port Huron site did measure the highest
concentration of  the state of  Michigan at 0.14 ppm for
the three hour period.
Mean, Maximum and Number of  Times Above Standard
TABLE 42
SO
2
for Port Huron Monitoring Station (year 2000, 2001)
Site Location
Year 2000
Year 2001
[a]
[b]
[c]
[d]
[e]
[a]
[b]
[c]
[d]
[e]
Port Huron
Dove Rd.
0.006
0.041
0
0.147
0
0.007
0.06
0
0.144
0
3
[a] Annual Arithmetic mean 80 µg/m  (0.03 ppm)
3
[b] 24-hr 365 µg/m  (0.14 ppm) Max. Value
[c] Number of  times above standard
3
[d] 3-hr 1300 µg/m  Max. Value
[e] Number of  times above standard
TABLE 43
Summary of  Annual Mean and 1-hour Maximum Concentration of  SO
2
for SLEAís Monitoring Site in Port Huron, MI
Primary NAAQS Annual Arithmetic mean - 0.03 ppm (30 ppb)
The U.S. does not have a 1-hour NAAQS (Ontarioís AAQC is 250 ppb)
Year
Mean
Max 1h
Year
Mean
Max 1h
1990
3
300
1995
4
150
1991
4
150
1996
5
210
1992
3
180
1997
5
230
1993
3
160
1998
5
250
1994
5
200
(SLEA operated an air quality monitoring station in Port Huron until 1998.)
51