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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 16, 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
North West - all times are in CST
6 10 7 5 5 4 4 5 8 10 19 34 FEW NA 6 1 R IDEM
13 37 31 30 29 30 24 6 17 27 23 26 FEW NA 13 1 R IDEM
16 38 37 28 18 18 13 13 17 20 28 33 FEW NA 16 1 R IDEM
28 32 29 23 16 13 11 16 25 26 29 29 FEW NA 28 1 R IDEM
31 20 21 24 18 8 12 14 5 13 18 21 FEW NA 31 1 R IDEM
34 17 17 11 5 4 1 3 17 21 24 29 FEW NA 34 1 R IDEM
48 15 17 3 2 1 1 2 4 8 20 29 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
North Central - all times are in EST
5 14 23 23 19 18 18 3 3 17 23 28 30 FEW 5 1 R IDEM
18 9 16 23 16 15 9 5 8 10 18 21 25 FEW 18 1 R IDEM
21 8 9 15 14 8 7 7 10 13 22 25 27 FEW 21 1 R IDEM
74 14 23 25 20 22 14 3 6 17 21 29 34 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
North East - all times are in EST
7 12 13 19 20 17 17 9 3 21 24 27 30 FEW 7 1 R IDEM
19 15 18 20 20 23 21 4 11 23 26 32 34 FEW 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
West Central - refer to the first data column for each site's specific time zone
EST9 18 19 19 19 19 17 16 17 18 21 23 24 FEW 9 1 R IDEM
EST36 21 25 23 19 16 16 19 16 25 29 34 36 FEW 36 1 R IDEM
EST37 16 17 19 19 19 17 17 17 17 20 21 26 FEW 37 1 R IDEM
CST38 19 20 21 19 18 16 14 18 23 25 27 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
East Central - all times are in EST
1 25 24 24 27 24 21 19 23 25 28 28 29 FEW 1 1 R IDEM
25 14 13 16 14 13 16 17 14 12 18 21 22 FEW 25 1 R IDEM
40 17 16 18 21 23 20 16 13 17 22 23 24 FEW 40 1 R IDEM
42 23 24 26 26 23 21 21 22 23 28 29 30 FEW 42 1 R IDEM
56 23 21 19 18 18 12 16 17 21 26 26 29 FEW 56 1 R IDEM
60 27 24 27 28 25 25 24 26 27 29 29 31 FEW 60 1 R IDEM
61 20 17 20 19 20 19 17 16 20 21 21 24 FEW 61 1 R IDEM
63 23 23 23 26 22 20 21 23 25 26 29 PM PM 63 1 R IDEM
64 14 19 18 16 18 18 17 17 22 23 23 23 FEW 64 1 R IDEM
65 20 21 18 22 22 22 20 18 23 30 33 34 FEW 65 1 R IDEM
66 20 18 21 20 17 14 16 17 19 19 20 26 FEW 66 1 R IDEM
68 19 18 19 19 20 16 15 22 FEW LOST NA NA NA 68 1 R IDEM
71 19 21 20 21 21 22 22 22 22 26 28 30 FEW 71 1 R IDEM
78 14 20 19 18 13 11 11 11 13 15 18 24 FEW 78 1 R IDEM
80 SPZ 17 17 21 21 19 15 19 19 19 23 28 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
South West - refer to the first data column for each site's specific time zone
CST12 25 24 21 20 20 22 19 18 21 22 24 FEW NA 12 1 R IDEM
CST15 26 24 23 23 24 23 20 22 21 22 26 FEW NA 15 1 R IDEM
CST20 23 17 19 20 19 18 18 20 23 23 26 FEW NA 20 1 R IDEM
CST24 24 25 22 21 21 17 18 22 22 24 28 FEW NA 24 1 R IDEM
CST33 24 22 20 18 19 23 23 24 24 25 28 FEW NA 33 1 R IDEM
CST49 23 23 23 25 25 23 22 22 25 26 29 FEW NA 49 1 R IDEM
CST52 25 25 23 21 22 21 19 17 20 21 25 FEW NA 52 1 R IDEM
EST67 27 21 20 23 23 25 23 23 25 29 29 31 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
South East - all times are in EST
3 14 20 17 13 19 21 20 24 23 23 22 27 FEW 3 1 R IDEM
4 14 11 11 16 17 18 17 20 22 23 22 25 FEW 4 1 R IDEM
59 20 17 21 19 21 24 25 23 24 26 29 32 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.