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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 Tuesday, September 2, 2014.
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
North West - all times are in CST
6 31 28 21 17 17 11 8 11 15 26 35 41 FEW NA 6 1 R IDEM
13 28 20 18 15 13 5 8 14 15 22 31 33 FEW NA 13 1 R IDEM
16 31 23 21 21 21 15 14 9 9 14 PM PM FEW NA 16 1 R IDEM
28 37 34 30 25 21 18 20 24 25 23 30 37 FEW NA 28 1 R IDEM
31 26 15 12 14 10 2 5 13 14 20 29 41 FEW NA 31 1 R IDEM
34 27 23 22 18 13 11 10 12 14 15 18 28 FEW NA 34 1 R IDEM
48 26 24 18 17 12 7 6 9 11 17 28 36 FEW 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
North Central - all times are in EST
5 35 33 32 29 27 21 16 22 25 25 22 23 30 FEW 5 1 R IDEM
18 27 28 27 22 22 20 21 27 25 23 22 22 26 FEW 18 1 R IDEM
21 28 28 26 22 19 17 20 22 22 23 20 19 25 FEW 21 1 R IDEM
74 37 36 35 31 29 24 19 18 21 25 24 24 33 FEW 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
North East - all times are in EST
7 34 33 32 30 33 34 28 25 26 26 25 27 30 FEW 7 1 R IDEM
19 38 37 35 34 33 37 32 28 29 33 30 30 36 FEW 19 1 R IDEM
27 32 27 29 29 36 32 26 24 27 25 25 25 29 FEW 27 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
West Central - refer to the first data column for each site's specific time zone
EST9 33 34 34 35 33 34 30 27 29 28 27 30 28 FEW 9 1 R IDEM
EST36 32 35 38 36 33 31 24 26 28 30 34 36 35 FEW 36 1 R IDEM
EST37 29 33 32 33 33 34 32 30 29 29 27 27 25 FEW 37 1 R IDEM
CST38 33 34 32 29 32 30 27 26 27 24 28 31 FEW 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
East Central - all times are in EST
1 20 25 39 38 31 35 37 32 29 31 31 31 32 FEW 1 1 R IDEM
25 SPZ 7 11 24 22 22 23 19 18 21 22 22 24 FEW 25 1 R IDEM
40 17 16 21 28 31 31 31 28 28 28 28 29 31 FEW 40 1 R IDEM
42 21 23 38 34 27 30 33 26 22 21 21 30 31 FEW 42 1 R IDEM
56 19 25 37 38 40 37 38 27 29 31 32 36 35 FEW 56 1 R IDEM
60 17 26 37 38 30 30 36 31 27 30 27 28 33 FEW 60 1 R IDEM
63 25 23 39 41 36 40 38 36 35 36 39 37 37 FEW 63 1 R IDEM
64 19 16 24 38 34 36 34 28 30 31 32 29 31 FEW 64 1 R IDEM
65 31 32 37 37 37 34 35 31 30 32 34 36 34 FEW 65 1 R IDEM
66 17 22 28 29 28 26 27 22 22 23 25 28 29 FEW 66 1 R IDEM
68 16 16 23 40 31 33 36 34 32 32 35 37 36 FEW 68 1 R IDEM
71 29 27 29 35 31 29 28 26 25 27 30 30 27 FEW 71 1 R IDEM
76 CAL CAL 11 36 48 41 39 38 37 39 41 37 37 FEW 76 1 R IDEM
78 16 22 37 32 31 34 36 29 23 21 18 19 23 FEW 78 1 R IDEM
80 SPN 8 24 44 35 35 36 33 33 33 31 28 32 FEW 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
South West - refer to the first data column for each site's specific time zone
CST12 4 8 9 13 36 34 29 29 25 24 20 31 FEW NA 12 1 R IDEM
CST15 12 11 10 16 34 33 24 25 26 23 23 32 FEW NA 15 1 R IDEM
CST20 12 12 12 27 36 24 26 27 22 21 25 30 FEW NA 20 1 R IDEM
CST24 15 13 13 27 29 30 28 25 25 24 25 32 FEW NA 24 1 R IDEM
CST33 15 14 13 16 35 33 29 27 24 22 25 29 FEW NA 33 1 R IDEM
CST49 12 12 13 12 24 31 31 30 30 28 29 30 FEW NA 49 1 R IDEM
CST52 7 10 8 11 29 30 29 26 23 21 25 29 FEW NA 52 1 R IDEM
EST67 22 22 46 44 40 38 37 34 34 33 32 29 29 FEW 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
South East - all times are in EST
3 15 15 16 13 13 9 31 31 28 24 28 32 34 FEW 3 1 R IDEM
4 8 13 11 8 9 8 36 32 32 32 32 31 33 FEW 4 1 R IDEM
59 8 7 8 21 40 39 33 31 32 30 31 28 27 FEW 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.