2006 Four Highest Maximum 8-hour Ozone Averages by Monitor
Based on Information Received by East-West Gateway Measured in Parts Per Billion
Monitor
First Highest
Second Highest
Third Highest
Fourth Highest
MISSOURI
April 1-August 27, 2006
Arnold
89
85
84
80
West Alton
97
91
91
91
Orchard Farm
95
93
92
92
Maryland Heights
92
87
87
84
Sunset Hills
98
96
89
84
Pacific
90
81
81
79
Blair St.
85
83
77
76
Margaretta
84
79
77
76
Foley *
90
88
85
84
Bonne Terre *
91
78
78
77
ILLINOIS
May 1-August 27, 2006
Wood River
81
80
78
77
Maryville
89
84
77
77
Alton
85
80
79
79
East St. Louis
98
97
82
77
Jerseyville
83
79
77
75
Nilwood *
73
71
70
70
Houston *
77
76
73
72
*Monitors are outside the St. Louis 8-hour ozone non-attainment area
8-hour ozone standard is 85 parts per billion (ppb) Exceedances of the standard are in bold.
To attain the eight-hour ozone standard, the three year average of the annual fourth highest daily maximum eight-hour ozone concentration as measured at each monitor has to be less than or equal to 85
ppb.
Source: Missouri Department of Natural Resources and Illinois Environmental Protection Agency. Information is preliminary and has not been quality assured
East-West Gateway Council of Governments One Memorial Dr., Ste 1600
St. Louis, MO 63102 phone: (314) 421-4220 or (618) 274-2750 fax: (314) 231-6120 e-mail: webmaster@ewgateway.org
