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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)
Select a Region:

Ozone Hourly Averages for Saturday, August 29, 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
North West - all times are in CST
6 20 21 25 22 19 19 15 14 20 19 29 36 40 38 38 30 31 NA NA 6 1 R IDEM
13 19 19 23 26 25 22 24 14 14 16 23 28 33 36 36 34 20 NA NA 13 1 R IDEM
16 35 32 35 37 35 30 27 21 20 19 20 23 25 33 33 29 27 NA NA 16 1 R IDEM
28 22 18 17 22 22 20 20 17 15 17 19 20 26 36 41 31 20 NA NA 28 1 R IDEM
31 18 15 16 18 22 17 19 11 15 18 24 28 31 35 33 35 30 NA NA 31 1 R IDEM
34 29 25 25 27 24 22 20 18 12 14 18 19 20 26 27 25 21 NA NA 34 1 R IDEM
48 24 27 30 27 30 27 21 19 12 22 32 39 46 47 45 40 33 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
North Central - all times are in EST
5 25 25 25 24 23 22 22 19 24 18 18 17 15 19 27 30 31 28 FEW 5 1 R IDEM
18 30 31 22 21 20 22 23 20 22 19 12 15 11 12 27 21 14 21 NA 18 1 R IDEM
21 26 28 29 26 28 26 23 22 20 17 16 16 15 14 20 16 17 19 NA 21 1 R IDEM
74 24 24 25 26 22 22 19 18 17 17 17 18 15 18 22 26 28 25 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
North East - all times are in EST
7 SPZ 19 17 17 16 13 8 9 11 21 37 42 44 44 38 31 28 29 NA 7 1 R IDEM
19 20 22 19 15 17 16 15 15 15 21 33 41 44 45 42 35 31 29 NA 19 1 R IDEM
27 30 SPZ 25 19 16 16 15 11 13 25 35 39 37 41 31 38 42 39 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
West Central - refer to the first data column for each site's specific time zone
EST37 31 26 23 17 16 19 30 29 26 29 34 42 45 47 48 45 43 41 NA 37 1 R IDEM
CST38 15 14 14 11 8 15 20 25 34 39 42 42 43 42 44 46 45 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
East Central - all times are in EST
1 39 33 30 31 27 28 26 26 27 32 40 44 45 48 49 47 49 48 NA 1 1 R IDEM
25 35 34 33 32 31 31 28 29 30 33 36 42 43 42 43 43 45 47 NA 25 1 R IDEM
40 25 18 20 17 19 19 21 24 28 33 39 45 46 47 47 47 46 33 NA 40 1 R IDEM
42 44 37 34 35 30 29 28 27 27 34 39 41 43 48 51 53 53 52 NA 42 1 R IDEM
56 41 37 36 34 33 31 30 28 24 30 37 41 43 46 45 47 50 46 NA 56 1 R IDEM
60 40 33 31 32 29 27 29 28 28 33 45 50 52 52 56 54 53 53 NA 60 1 R IDEM
61 36 36 36 33 31 31 30 30 31 36 39 46 51 50 53 53 54 54 NA 61 1 R IDEM
63 37 35 35 34 33 34 34 32 31 33 35 37 39 40 41 45 46 43 NA 63 1 R IDEM
64 35 36 26 16 23 27 30 32 30 32 36 38 40 44 47 45 45 45 NA 64 1 R IDEM
65 36 33 32 31 27 26 27 27 30 35 40 45 45 50 49 49 50 46 NA 65 1 R IDEM
66 32 30 28 23 19 21 21 20 22 30 35 36 34 39 39 41 43 42 NA 66 1 R IDEM
68 25 17 8 11 12 18 25 24 27 29 35 39 40 43 43 45 46 45 NA 68 1 R IDEM
71 34 30 25 22 21 21 22 26 30 34 41 49 56 57 60 60 56 52 NA 71 1 R IDEM
76 28 32 29 28 25 26 26 28 32 37 40 41 46 48 51 50 48 46 NA 76 1 R IDEM
78 40 36 34 31 27 27 27 26 28 34 36 38 39 46 48 47 48 49 NA 78 1 R IDEM
80 0 2 4 2 1 1 1 3 17 29 34 38 39 44 45 46 35 16 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
South West - refer to the first data column for each site's specific time zone
CST12 29 26 27 27 25 21 24 25 25 34 33 42 48 53 50 45 46 NA NA 12 1 R IDEM
CST15 10 18 28 28 28 26 26 27 28 32 36 39 44 44 45 46 45 NA NA 15 1 R IDEM
CST20 25 18 20 20 19 18 19 18 24 30 36 40 41 43 42 35 30 NA NA 20 1 R IDEM
CST24 28 24 21 19 17 17 16 21 27 34 38 42 43 44 41 39 22 NA NA 24 1 R IDEM
CST33 25 25 29 30 28 26 25 26 29 30 35 41 39 43 43 39 36 NA NA 33 1 R IDEM
CST49 38 37 36 34 33 32 32 33 35 38 39 46 51 55 54 55 49 NA NA 49 1 R IDEM
CST52 25 28 27 24 22 20 23 24 29 32 31 39 46 53 50 49 42 NA NA 52 1 R IDEM
EST67 22 40 37 33 31 31 31 30 31 34 35 40 47 50 52 44 45 44 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
South East - all times are in EST
3 7 6 6 7 6 1 0 4 20 31 40 42 47 52 48 53 51 48 FEW 3 1 R IDEM
4 31 32 26 31 25 21 21 22 27 35 40 49 56 56 50 51 51 44 FEW 4 1 R IDEM
59 CAL CAL 29 25 26 24 13 10 24 31 37 43 47 48 53 57 48 43 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.