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Ozone Hourly Averages

Ozone is a form of oxygen with three atoms instead of the usual two atoms. It is a photochemical oxidant and, at ground level, is the main component of smog. Unlike other gaseous pollutants, ozone is not emitted directly into the atmosphere. Instead, it is created in the atmosphere by the action of sunlight on volatile organic compounds and nitrogen oxides.

In general, higher levels of ozone usually occur on sunny days with light winds, primarily from March through October. An ozone exceedance day is counted if the measured eight-hour average ozone concentration exceeds the standards.

Use the controls below to select a different date or parameter and to control cell highlighting based on measured Ozone levels. Click on the Generate Report button once you have made your selections.

Click on the Plot Data button once the tabular report has been generated to open a separate window containing data plots.
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Ozone Highlights:  Moderate   Unhealthy for Sensitives   Unhealthy   Very Unhealthy  
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Ozone Hourly Averages for Wednesday, July 1, 2015.
measured in parts per billion
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
North West - all times are in CST
6 19 20 19 20 22 25 25 26 27 25 27 24 FEW NA NA 6 1 R IDEM
16 22 23 22 24 26 28 31 29 29 28 29 31 FEW NA NA 16 1 R IDEM
28 15 15 16 16 17 20 24 26 28 29 29 29 PM NA NA 28 1 R IDEM
31 20 21 21 22 25 26 27 27 29 30 30 31 FEW NA NA 31 1 R IDEM
34 14 15 16 17 17 23 26 26 28 30 29 30 FEW NA NA 34 1 R IDEM
48 25 25 24 26 28 29 29 31 30 31 33 34 FEW NA NA 48 1 N IDEM
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
North Central - all times are in EST
5 22 18 18 20 22 27 28 29 30 30 34 36 38 PM NA 5 1 R IDEM
18 20 18 18 19 17 21 21 20 21 24 26 29 31 FEW NA 18 1 R IDEM
21 13 12 11 12 12 15 21 22 23 25 27 29 31 FEW NA 21 1 R IDEM
74 24 25 23 20 20 27 28 28 29 31 34 36 37 FEW NA 74 1 R IDEM
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
North East - all times are in EST
7 33 29 26 21 18 16 20 24 24 27 31 34 36 FEW NA 7 1 R IDEM
19 37 31 27 24 21 21 21 23 27 31 35 36 38 40 NA 19 1 R IDEM
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
West Central - refer to the first data column for each site's specific time zone
EST9 9 2 2 0 1 8 7 11 19 31 36 38 40 FEW NA 9 1 R IDEM
EST36 35 26 28 20 19 17 16 20 22 24 25 32 38 FEW NA 36 1 R IDEM
EST37 4 3 3 0 0 1 7 17 21 26 29 34 38 FEW NA 37 1 R IDEM
CST38 CAL 11 8 9 7 8 10 20 24 29 35 39 FEW NA NA 38 1 R IDEM
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
East Central - all times are in EST
1 35 26 19 16 10 6 13 23 27 31 36 41 47 FEW NA 1 1 R IDEM
25 36 23 16 11 9 9 11 16 20 24 29 33 36 FEW NA 25 1 R IDEM
40 31 27 26 29 27 22 21 24 25 29 32 34 39 FEW NA 40 1 R IDEM
42 34 24 19 13 12 8 15 26 29 30 39 43 47 FEW NA 42 1 R IDEM
56 39 43 15 12 10 1 12 14 20 24 31 30 36 FEW NA 56 1 R IDEM
60 29 27 24 17 13 12 15 25 30 33 39 45 49 FEW NA 60 1 R IDEM
61 CAL CAL 7 5 10 8 5 9 12 14 18 28 40 FEW NA 61 1 R IDEM
63 10 6 6 3 1 3 9 17 22 20 35 43 44 FEW NA 63 1 R IDEM
64 29 20 18 18 14 6 18 25 30 35 42 45 47 FEW NA 64 1 R IDEM
65 44 42 37 33 32 28 26 27 29 32 38 42 49 FEW NA 65 1 R IDEM
66 25 14 18 23 20 19 19 18 19 23 26 27 34 FEW NA 66 1 R IDEM
68 19 4 9 12 4 3 13 28 30 31 39 46 50 FEW NA 68 1 R IDEM
71 39 28 23 20 21 21 17 24 27 29 33 39 45 FEW NA 71 1 R IDEM
76 29 21 11 10 18 16 12 25 38 40 45 53 53 FEW NA 76 1 R IDEM
78 28 20 18 11 6 5 8 13 15 21 36 44 44 FEW NA 78 1 R IDEM
80 SPN 2 0 0 0 0 0 2 12 26 35 44 41 FEW NA 80 1 R IDEM
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
South West - refer to the first data column for each site's specific time zone
CST12 19 15 10 7 4 2 6 7 12 13 19 21 FEW NA NA 12 1 R IDEM
CST15 22 18 15 12 7 4 4 13 20 19 17 40 NA NA NA 15 1 R IDEM
CST20 20 18 7 4 3 0 1 9 16 16 17 25 FEW NA NA 20 1 R IDEM
CST24 24 24 20 18 17 17 13 11 19 16 16 29 FEW NA NA 24 1 R IDEM
CST33 13 14 10 11 6 7 4 12 15 11 19 42 FEW NA NA 33 1 R IDEM
CST49 25 21 20 18 15 14 14 16 22 24 28 31 QAS NA NA 49 1 R IDEM
CST52 18 19 15 3 1 0 4 8 13 17 18 34 FEW NA NA 52 1 R IDEM
EST67 10 4 3 2 1 1 6 12 23 31 32 39 44 FEW NA 67 1 R IDEM
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
South East - all times are in EST
3 28 25 20 19 13 3 0 6 23 27 29 31 38 38 NA 3 1 R IDEM
4 33 23 18 15 14 4 6 5 10 QAS QAS 32 44 46 NA 4 1 R IDEM
59 19 11 13 16 12 8 10 21 22 29 33 39 42 FEW NA 59 1 R IDEM
Maximum values for the day are bold within the table. Minimum values are bold italic.
 R - Data from this instrument meets EPA quality assurance criteria for regulatory purposes.
 N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used for regulatory purposes.

PLEASE NOTE: This data has not been verified by the IDEM and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from IDEM ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.