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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 Monday, May 30, 2016.
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 18 18 16 13 15 22 26 37 48 55 56 56 55 58 61 63 62 63 56 55 54 FEW NA 6 1 R IDEM
13 1 5 3 1 3 8 16 30 44 51 52 54 56 61 60 63 64 59 54 43 32 FEW NA 13 1 R IDEM
28 28 29 33 28 28 30 33 36 44 49 56 59 68 71 70 69 70 67 58 48 38 FEW NA 28 1 R IDEM
31 17 6 7 8 11 15 25 FEW FEW 50 53 54 56 58 57 59 64 65 58 53 54 FEW NA 31 1 R IDEM
34 19 19 7 11 10 15 29 40 46 53 56 61 65 66 65 65 65 60 52 23 14 FEW NA 34 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 Central - all times are in EST
5 35 35 31 27 21 17 25 31 38 43 52 55 56 56 59 63 64 62 59 54 48 45 FEW 5 1 R IDEM
18 22 19 21 18 18 16 17 26 33 43 53 55 56 56 55 57 59 59 58 54 45 33 FEW 18 1 R IDEM
21 25 21 22 20 21 24 23 26 32 39 48 55 57 61 64 64 64 65 64 51 44 39 FEW 21 1 R IDEM
74 32 28 20 20 15 9 20 32 37 44 52 54 54 55 56 59 61 58 56 55 46 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 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 36 29 21 19 27 27 31 38 43 48 54 54 55 57 57 60 62 60 60 55 47 41 FEW 7 1 R IDEM
27 28 17 13 14 16 12 20 27 31 39 49 50 51 51 53 54 55 56 57 54 45 39 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 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 32 13 8 11 5 0 3 20 29 40 54 58 59 58 59 60 61 61 60 51 36 22 FEW 9 1 R IDEM
EST36 SPZ 21 15 8 11 12 18 28 42 53 56 57 57 57 58 58 59 58 55 43 29 33 FEW 36 1 R IDEM
EST37 36 27 15 16 17 7 3 10 31 43 55 58 56 56 57 59 56 53 54 47 37 26 FEW 37 1 R IDEM
CST38 SPZ 10 7 6 2 5 16 35 47 55 56 56 57 58 59 59 57 46 31 16 16 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 6:00 7:00 8:00 9:0010:00
East Central - all times are in EST
1 SPZ 20 13 14 12 9 7 21 39 52 56 55 57 57 58 59 60 58 57 52 40 29 FEW 1 1 R IDEM
25 25 SPZ 25 16 9 16 14 23 37 52 55 56 55 55 56 56 55 56 54 49 46 41 FEW 25 1 R IDEM
40 21 17 12 5 FEW LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST NA NA NA 40 1 R IDEM
42 4 4 7 8 8 9 10 30 44 54 57 60 57 58 58 60 59 59 56 51 46 28 FEW 42 1 R IDEM
56 SPZ 10 11 7 9 6 6 24 36 49 53 61 60 60 60 60 61 59 57 52 46 37 FEW 56 1 R IDEM
60 42 43 35 29 24 22 13 28 44 55 58 59 60 59 61 62 61 61 60 55 45 39 FEW 60 1 R IDEM
63 15 13 11 6 7 5 6 19 32 46 54 56 56 56 56 55 54 57 54 49 38 27 FEW 63 1 R IDEM
64 19 21 19 17 17 17 20 23 31 43 53 54 54 54 56 57 56 55 51 45 34 31 FEW 64 1 R IDEM
65 41 42 39 36 31 31 24 29 46 55 56 56 57 57 56 56 57 57 57 54 46 44 FEW 65 1 R IDEM
66 36 30 24 33 28 21 18 29 36 49 52 53 53 54 54 55 53 53 56 50 43 37 FEW 66 1 R IDEM
68 27 25 24 20 11 9 14 30 36 50 53 54 55 56 58 61 61 61 59 52 45 44 FEW 68 1 R IDEM
71 34 20 20 16 14 12 8 19 34 43 47 48 48 48 47 48 46 47 47 44 36 33 FEW 71 1 R IDEM
76 30 28 26 15 14 10 12 31 41 58 61 62 62 62 60 62 65 67 64 57 51 33 FEW 76 1 R IDEM
78 11 5 5 5 4 2 7 19 30 45 49 53 53 53 50 51 52 51 50 52 49 33 FEW 78 1 R IDEM
80 2 2 2 2 2 2 2 4 17 33 55 58 58 58 59 59 58 55 37 27 26 20 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 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 3 3 1 1 1 3 14 36 48 57 57 56 56 58 66 67 66 62 45 32 28 FEW NA 12 1 R IDEM
CST15 2 6 8 7 3 11 25 48 55 58 61 62 60 60 62 61 62 61 53 30 20 FEW NA 15 1 R IDEM
CST20 3 7 FEW LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST NA NA NA 20 1 R IDEM
CST24 33 38 30 27 28 36 38 40 52 56 59 59 60 60 60 61 62 53 38 33 36 FEW NA 24 1 R IDEM
CST33 17 15 16 14 13 11 21 42 49 57 59 59 60 59 59 60 59 55 42 28 14 FEW NA 33 1 R IDEM
CST49 36 34 31 26 21 16 26 37 48 53 54 55 56 57 57 58 56 51 38 32 35 FEW NA 49 1 R IDEM
CST52 4 3 0 0 0 2 17 33 51 53 60 55 52 48 58 63 62 56 41 26 15 FEW NA 52 1 R IDEM
EST67 13 7 4 2 0 0 1 8 34 44 56 58 59 59 60 59 60 59 53 45 41 27 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 6:00 7:00 8:00 9:0010:00
South East - all times are in EST
3 42 40 39 38 29 22 21 28 42 52 56 57 60 57 57 58 58 59 59 46 33 24 FEW 3 1 R IDEM
4 38 35 21 10 18 14 13 28 37 43 53 60 56 56 56 57 57 57 54 49 40 35 FEW 4 1 R IDEM
59 SPZ 34 24 21 20 21 14 29 41 51 57 57 56 55 54 54 56 57 55 53 29 19 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.

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.