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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.
Select a date: Time Format: Select a Parameter:
   
Ozone Highlights:  Moderate   Unhealthy for Sensitives   Unhealthy   Very Unhealthy  
Highlight validated data (Validated data has been manually reviewed by a data validator)
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Ozone Hourly Averages for Sunday, May 24, 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 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:00
North West - all times are in CST
6 32 33 33 29 29 30 30 31 34 40 50 54 57 50 50 47 40 43 35 39 FEW NA NA 6 1 R IDEM
13 29 31 25 21 18 26 30 33 31 37 50 52 57 58 52 47 34 48 49 50 FEW NA NA 13 1 R IDEM
16 42 39 39 40 40 41 40 41 38 39 47 53 56 58 58 56 52 51 49 45 FEW NA NA 16 1 R IDEM
28 30 29 27 23 24 28 31 35 34 41 49 53 57 55 53 52 50 50 48 43 FEW NA NA 28 1 R IDEM
31 26 30 23 23 23 27 28 31 31 38 50 55 59 59 51 45 31 43 47 49 FEW NA NA 31 1 R IDEM
34 31 28 24 19 28 36 36 37 37 40 48 52 55 56 56 55 51 48 46 42 FEW NA NA 34 1 R IDEM
48 48 41 42 38 40 39 38 40 31 38 42 45 47 58 59 54 45 53 54 45 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 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:00
North Central - all times are in EST
5 SPN 13 12 9 10 13 25 33 44 47 48 51 54 61 63 63 66 66 65 61 56 FEW NA 5 1 R IDEM
18 SPN 31 38 31 16 6 8 24 37 41 42 41 44 48 52 51 52 54 53 49 48 FEW NA 18 1 R IDEM
21 SPN 24 25 23 27 34 37 35 38 36 40 43 49 55 55 59 58 58 54 53 49 FEW NA 21 1 R IDEM
74 SPN 25 26 22 20 15 22 31 38 46 46 49 52 57 60 59 62 65 65 60 55 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 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:00
North East - all times are in EST
7 SPN 28 32 26 18 15 18 25 39 40 41 46 53 55 55 56 56 56 56 56 50 FEW NA 7 1 R IDEM
19 SPN 10 7 9 7 6 10 28 36 44 42 47 54 58 57 58 58 58 57 56 51 FEW NA 19 1 R IDEM
27 SPN 21 12 7 7 5 16 21 27 29 33 38 43 43 44 45 46 45 46 43 37 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 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:00
West Central - refer to the first data column for each site's specific time zone
EST9 39 46 46 44 39 41 39 38 43 50 56 61 59 59 61 62 61 60 58 54 50 FEW NA 9 1 R IDEM
EST36 SPN 24 26 26 20 21 21 29 34 42 51 57 59 59 58 55 53 51 48 45 40 FEW NA 36 1 R IDEM
EST37 SPN 41 40 40 38 37 36 37 38 47 55 60 57 58 58 59 57 58 55 52 48 FEW NA 37 1 R IDEM
CST38 26 19 21 20 22 25 38 42 51 59 63 62 62 61 58 60 58 59 55 46 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 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:00
East Central - all times are in EST
1 SPN 39 38 38 36 34 33 32 34 43 49 51 52 52 52 53 52 51 51 51 47 FEW NA 1 1 R IDEM
25 SPN 45 FEW LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST NA NA NA 25 1 R IDEM
40 SPN 24 23 20 25 26 31 36 37 39 44 48 50 50 51 51 54 55 51 47 43 FEW NA 40 1 R IDEM
42 SPN SPN 43 42 40 37 38 37 41 51 57 59 61 61 61 61 59 57 57 57 53 FEW NA 42 1 R IDEM
56 42 42 41 41 40 38 36 34 37 38 35 39 48 44 48 46 47 44 48 48 47 FEW NA 56 1 R IDEM
60 SPN 44 42 41 38 38 34 35 37 47 55 57 58 58 58 59 58 56 56 59 54 FEW NA 60 1 R IDEM
63 SPN 52 49 50 50 50 51 50 50 55 60 62 62 61 60 59 56 56 56 54 52 FEW NA 63 1 R IDEM
64 SPN 46 45 45 43 41 40 40 44 48 51 54 55 56 56 56 54 53 53 54 52 FEW NA 64 1 R IDEM
65 SPN 37 35 35 36 36 35 30 42 51 54 59 61 62 59 57 53 50 50 48 48 FEW NA 65 1 R IDEM
66 SPN 31 36 33 26 27 25 27 31 38 44 45 47 45 45 43 42 42 42 41 40 FEW NA 66 1 R IDEM
68 SPN 41 39 37 35 33 31 32 37 45 49 51 52 53 54 55 55 56 55 51 45 FEW NA 68 1 R IDEM
71 SPN 17 22 17 15 9 12 21 21 25 36 40 40 41 41 40 40 37 38 40 37 FEW NA 71 1 R IDEM
76 SPN 44 41 40 40 39 37 39 42 52 56 58 61 64 65 65 65 63 58 53 49 FEW NA 76 1 R IDEM
78 SPN 42 43 41 41 36 36 34 39 49 54 57 59 58 59 59 58 56 54 57 53 FEW NA 78 1 R IDEM
80 14 10 9 11 15 15 19 36 40 47 52 53 53 53 52 50 49 49 47 47 48 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 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:00
South West - refer to the first data column for each site's specific time zone
CST12 25 19 31 31 30 31 40 48 50 52 53 54 54 55 58 63 57 54 51 47 FEW NA NA 12 1 R IDEM
CST15 21 16 23 32 34 33 40 48 50 55 56 56 57 57 53 51 50 51 49 43 FEW NA NA 15 1 R IDEM
CST20 35 31 39 36 33 34 35 45 49 51 54 56 54 52 54 60 57 53 50 46 FEW NA NA 20 1 R IDEM
CST24 30 32 36 29 32 34 36 46 51 54 56 58 58 56 51 50 52 53 50 43 FEW NA NA 24 1 R IDEM
CST33 32 31 35 34 34 37 40 44 48 50 51 51 51 50 47 45 42 43 44 42 FEW NA NA 33 1 R IDEM
CST49 42 42 43 41 40 40 41 44 49 53 54 55 56 56 55 54 52 52 52 49 FEW NA NA 49 1 R IDEM
EST67 SPN 28 31 31 38 40 41 45 49 52 55 59 60 60 59 57 54 54 53 50 47 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 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:00
South East - all times are in EST
3 SPN 9 11 11 9 10 7 16 33 45 52 56 56 57 55 54 52 51 49 44 40 FEW NA 3 1 R IDEM
4 SPN 37 36 33 28 32 27 34 41 51 54 56 57 58 57 55 54 52 51 52 50 FEW NA 4 1 R IDEM
59 SPN 27 35 28 28 30 28 26 38 48 49 51 52 52 53 51 51 52 52 48 44 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.

Key to Ozone Highlight Colors:

Hourly ozone levels have been mapped to a set of surrogate values based on custom 1-hour breakpoints.
The table below shows the levels, color-coding, and suggested actions for the 1-hour surrogate.

Ozone levels in this range are projected to be moderate based on the one-hour surrogate calculation for Ozone.
  • Unusually sensitive individuals may experience respiratory symptoms.
  • Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion.

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.