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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 30, 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 2:00 3:00 4:00 5:00
North West - all times are in CST
6 38 37 34 32 34 29 29 32 32 37 41 42 40 40 41 38 FEW NA 6 1 R IDEM
13 36 35 35 33 30 29 27 27 31 33 39 40 41 41 42 44 FEW NA 13 1 R IDEM
16 37 33 30 31 30 29 27 28 30 34 39 42 45 43 43 44 FEW NA 16 1 R IDEM
28 32 32 35 PM 29 28 27 27 30 35 39 42 42 PM 42 45 FEW NA 28 1 R IDEM
31 32 29 28 28 28 26 24 26 28 32 38 38 37 38 39 41 FEW NA 31 1 R IDEM
34 28 27 26 25 24 22 20 18 21 26 30 34 35 32 35 34 FEW NA 34 1 R IDEM
48 34 34 32 30 29 27 24 26 30 35 38 38 39 37 38 41 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 2:00 3:00 4:00 5:00
North Central - all times are in EST
5 38 35 35 33 32 34 30 29 27 27 33 38 42 45 43 42 44 FEW 5 1 R IDEM
18 33 33 33 33 35 33 29 27 25 24 26 30 35 40 41 40 41 FEW 18 1 R IDEM
21 36 32 31 30 29 27 23 22 21 22 27 30 34 35 35 35 31 FEW 21 1 R IDEM
74 37 32 32 33 32 32 27 24 25 27 33 38 43 46 45 42 45 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 2:00 3:00 4:00 5:00
North East - all times are in EST
7 36 35 34 32 31 31 31 32 32 33 35 38 40 42 40 42 41 FEW 7 1 R IDEM
19 33 36 34 32 33 32 33 34 36 36 39 43 45 46 45 45 46 FEW 19 1 R IDEM
27 32 30 28 27 27 28 29 29 27 28 31 34 35 37 36 36 35 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 2:00 3:00 4:00 5:00
West Central - refer to the first data column for each site's specific time zone
EST9 33 34 32 33 31 30 29 29 31 32 30 33 36 39 40 35 35 FEW 9 1 R IDEM
EST36 34 38 38 37 37 35 33 32 32 33 37 40 42 42 42 41 41 FEW 36 1 R IDEM
EST37 31 28 27 29 31 28 26 27 29 30 29 32 34 37 37 34 33 FEW 37 1 R IDEM
CST38 28 27 30 26 25 28 27 27 27 26 29 32 35 32 32 33 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 2:00 3:00 4:00 5:00
East Central - all times are in EST
1 40 39 36 31 34 33 30 30 35 35 38 38 38 40 39 38 39 FEW 1 1 R IDEM
25 SPZ 31 31 30 28 28 26 23 24 24 26 27 28 28 27 26 27 FEW 25 1 R IDEM
40 34 30 32 31 31 32 31 30 31 33 34 35 36 37 35 34 33 FEW 40 1 R IDEM
42 39 43 39 35 35 34 31 29 27 33 32 30 33 35 35 35 36 FEW 42 1 R IDEM
56 51 49 47 44 42 37 35 31 29 26 36 36 38 38 39 35 32 FEW 56 1 R IDEM
60 SPN 40 39 34 36 33 29 28 32 36 38 39 39 41 40 40 39 FEW 60 1 R IDEM
64 47 44 43 41 39 36 33 27 27 30 30 31 33 33 33 32 35 FEW 64 1 R IDEM
65 38 36 32 33 39 35 32 33 33 34 36 36 36 37 39 39 37 FEW 65 1 R IDEM
66 37 35 30 29 32 31 27 26 25 28 29 28 29 29 30 30 29 FEW 66 1 R IDEM
68 41 37 34 32 31 28 26 28 24 27 30 31 32 34 35 35 36 FEW 68 1 R IDEM
71 37 38 34 31 30 29 20 17 28 31 36 36 36 39 38 37 37 FEW 71 1 R IDEM
76 42 39 37 35 32 32 32 31 32 35 36 34 35 41 44 45 40 FEW 76 1 R IDEM
78 43 42 42 36 37 38 34 33 31 34 35 33 35 37 37 37 38 FEW 78 1 R IDEM
80 45 40 40 40 39 36 30 16 24 29 31 33 31 33 34 33 35 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 2:00 3:00 4:00 5:00
South West - refer to the first data column for each site's specific time zone
CST12 40 34 28 27 26 25 20 21 22 25 35 41 36 35 27 27 FEW NA 12 1 R IDEM
CST15 37 33 27 31 31 25 19 22 20 26 37 43 33 30 31 31 FEW NA 15 1 R IDEM
CST20 31 28 22 23 24 20 28 23 25 27 35 39 32 25 24 30 FEW NA 20 1 R IDEM
CST24 39 33 30 26 28 23 24 24 28 28 38 43 35 27 30 32 FEW NA 24 1 R IDEM
CST33 40 35 33 29 27 25 20 23 24 29 38 39 30 30 29 29 FEW NA 33 1 R IDEM
CST49 40 39 37 31 34 34 33 34 39 40 46 46 43 41 37 36 FEW NA 49 1 R IDEM
CST52 35 31 27 24 19 23 17 19 22 25 35 30 38 31 30 33 FEW NA 52 1 R IDEM
EST67 46 43 41 37 34 33 29 24 27 29 32 33 35 37 40 40 41 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 2:00 3:00 4:00 5:00
South East - all times are in EST
3 3 6 8 7 4 2 2 4 21 29 39 51 52 47 49 40 32 FEW 3 1 R IDEM
4 37 24 29 31 28 29 24 28 33 40 47 59 66 60 50 40 37 FEW 4 1 R IDEM
59 CAL CAL 18 10 11 12 10 19 20 24 26 25 28 35 33 28 31 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.

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.