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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 Monday, July 28, 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 26 27 29 27 22 20 20 22 23 QAS 27 FEW NA NA 6 1 R IDEM
13 23 25 26 25 23 22 21 21 20 21 21 FEW NA NA 13 1 R IDEM
16 23 24 24 24 23 21 20 19 19 19 19 FEW NA NA 16 1 R IDEM
28 23 23 25 25 24 22 21 20 20 20 20 FEW NA NA 28 1 R IDEM
31 CAL PM PM PM PM 15 14 14 16 PM PM PM NA NA 31 1 R IDEM
34 17 18 19 18 19 17 15 15 14 14 14 15 FEW NA 34 1 R IDEM
48 17 18 20 18 16 15 15 QAS QAS 17 19 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
North Central - all times are in EST
5 21 20 20 17 16 16 17 17 17 17 17 17 17 FEW 5 1 R IDEM
18 25 25 24 22 17 13 12 13 14 15 15 16 FEW NA 18 1 R IDEM
21 17 18 17 17 16 17 16 16 15 15 15 15 FEW NA 21 1 R IDEM
74 23 22 22 19 17 17 18 19 19 18 19 20 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
North East - all times are in EST
7 35 32 29 28 28 23 18 16 14 15 20 22 FEW NA 7 1 R IDEM
19 38 33 30 29 29 24 18 16 15 17 21 23 25 FEW 19 1 R IDEM
27 32 29 25 25 25 24 20 15 13 13 15 19 FEW NA 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 29 25 23 20 17 16 14 16 19 22 25 26 FEW NA 9 1 R IDEM
EST36 SPN 30 25 21 21 21 20 20 20 20 21 23 FEW NA 36 1 R IDEM
EST37 22 23 22 18 13 9 9 12 16 16 21 22 24 FEW 37 1 R IDEM
CST38 24 22 20 18 14 12 16 19 22 24 25 26 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 31 27 26 25 28 26 20 22 25 22 20 19 FEW NA 1 1 R IDEM
25 SPZ 21 21 22 21 19 12 12 15 16 15 16 FEW NA 25 1 R IDEM
40 26 28 29 27 25 23 20 18 15 17 16 17 FEW NA 40 1 R IDEM
42 30 27 25 24 27 23 18 22 25 22 18 19 FEW NA 42 1 R IDEM
56 31 30 27 26 25 20 17 17 22 20 20 19 22 FEW 56 1 R IDEM
60 30 28 27 27 26 24 20 22 25 22 20 21 22 FEW 60 1 R IDEM
61 26 24 26 26 23 20 16 17 18 17 14 14 FEW NA 61 1 R IDEM
63 29 27 26 27 26 24 20 21 22 23 23 24 FEW NA 63 1 R IDEM
64 25 23 22 20 19 21 19 18 19 19 20 19 FEW NA 64 1 R IDEM
65 25 22 24 26 20 18 19 19 21 18 19 20 FEW NA 65 1 R IDEM
66 23 21 19 19 19 15 12 14 15 13 12 12 15 FEW 66 1 R IDEM
68 30 28 25 26 25 25 22 20 22 24 21 19 FEW NA 68 1 R IDEM
71 27 24 24 24 21 18 19 20 20 18 17 19 FEW NA 71 1 R IDEM
76 33 29 26 25 23 22 23 27 25 28 32 27 24 FEW 76 1 R IDEM
80 LOST LOST LOST LOST LOST LOST LOST SPN SPN LIM PM PM PM 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
South West - refer to the first data column for each site's specific time zone
CST12 27 24 19 16 16 15 18 23 27 31 34 FEW NA NA 12 1 R IDEM
CST15 27 23 21 19 17 14 16 19 24 27 29 FEW NA NA 15 1 R IDEM
CST20 29 27 24 21 18 16 18 21 24 28 30 FEW NA NA 20 1 R IDEM
CST33 27 23 19 18 15 15 18 22 25 29 32 FEW NA NA 33 1 R IDEM
CST49 30 27 23 21 17 16 18 23 27 31 33 FEW NA NA 49 1 R IDEM
CST52 27 26 25 23 20 18 20 24 29 32 34 35 FEW NA 52 1 R IDEM
EST67 31 27 23 22 19 16 16 17 19 21 25 28 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
South East - all times are in EST
3 34 32 31 30 27 23 19 23 29 30 31 31 FEW NA 3 1 R IDEM
4 34 28 24 24 20 18 15 21 28 27 31 35 35 FEW 4 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.