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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 Sunday, July 24, 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 9:00
North West - all times are in CST
6 39 33 33 35 34 32 28 31 37 38 41 42 40 40 39 38 37 33 45 30 NA NA 6 1 R IDEM
13 35 29 28 29 26 27 28 28 32 34 37 37 32 33 32 31 31 29 36 40 NA NA 13 1 R IDEM
16 22 19 19 14 11 10 13 16 18 24 28 31 29 27 29 27 25 25 27 35 NA NA 16 1 R IDEM
28 39 33 28 27 28 28 29 29 30 36 39 40 35 38 38 36 34 32 33 40 NA NA 28 1 R IDEM
31 31 28 28 27 27 27 27 25 30 34 36 36 31 35 33 31 31 29 32 36 NA NA 31 1 R IDEM
34 35 33 30 28 26 21 23 25 31 34 35 41 40 35 40 37 32 27 25 38 NA 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 9:00
North Central - all times are in EST
5 SPN 42 43 37 35 34 30 26 25 31 36 41 40 42 42 40 43 36 34 31 30 FEW 5 1 R IDEM
18 SPN 29 41 36 32 30 26 25 26 27 23 27 31 33 36 37 38 39 39 41 39 NA 18 1 R IDEM
21 SPN 40 37 30 34 30 24 21 21 27 32 35 35 37 34 37 33 31 30 28 31 NA 21 1 R IDEM
74 SPN 43 42 35 36 30 30 28 23 26 28 27 33 39 43 41 43 39 36 34 32 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 9:00
North East - all times are in EST
7 SPN 32 37 48 41 32 28 31 30 32 40 46 48 41 47 52 53 56 45 44 43 NA 7 1 R IDEM
19 SPN 12 24 48 40 33 28 27 29 37 45 49 41 45 49 49 46 46 47 43 40 NA 19 1 R IDEM
27 SPN 18 39 39 33 26 22 21 19 22 31 38 39 42 43 42 41 39 35 36 36 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 9:00
West Central - refer to the first data column for each site's specific time zone
EST9 SPN 25 14 11 6 9 17 20 31 40 42 46 44 45 49 41 39 38 39 40 42 NA 9 1 R IDEM
EST36 SPN 42 41 31 24 22 23 27 28 32 35 40 41 39 39 38 38 38 36 35 26 NA 36 1 R IDEM
EST37 SPN 9 5 4 1 6 6 14 24 34 37 41 44 46 47 47 37 37 41 37 33 NA 37 1 R IDEM
CST38 3 2 1 0 1 2 13 27 33 39 43 48 36 33 33 35 35 32 30 23 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 9:00
East Central - all times are in EST
1 SPN 24 18 13 29 FEW 35 35 35 35 39 38 40 41 44 45 44 39 37 33 27 NA 1 1 R IDEM
25 SPN 21 17 34 36 32 29 30 31 34 34 35 36 37 35 34 35 34 32 FEW FEW NA 25 1 R IDEM
40 15 14 20 36 37 31 29 31 33 35 40 41 43 43 44 41 41 40 35 32 29 NA 40 1 R IDEM
42 SPN SPN 8 12 34 38 35 35 36 38 40 41 44 45 47 48 44 42 38 31 30 NA 42 1 R IDEM
56 SPN 10 10 10 22 25 28 26 27 29 29 31 35 37 39 40 37 35 32 29 24 NA 56 1 R IDEM
60 SPN 16 13 18 39 36 36 36 37 41 42 44 47 48 50 50 50 46 43 39 33 NA 60 1 R IDEM
63 SPN 7 6 4 2 4 7 16 22 29 34 38 43 41 42 43 41 37 34 39 38 NA 63 1 R IDEM
64 SPN 21 14 11 14 12 8 16 23 30 32 35 38 38 37 37 40 40 39 37 33 NA 64 1 R IDEM
65 SPN 19 21 36 35 37 35 35 35 37 39 41 39 36 40 45 44 41 43 48 40 NA 65 1 R IDEM
66 SPN 7 9 13 27 32 30 33 34 36 40 41 42 45 47 48 48 48 49 45 43 NA 66 1 R IDEM
68 SPN 18 3 5 7 10 16 24 29 37 37 37 36 36 37 38 38 35 36 37 32 NA 68 1 R IDEM
71 SPN 10 15 40 39 31 32 33 34 39 43 48 48 48 47 50 49 46 46 43 39 NA 71 1 R IDEM
76 SPN 13 11 12 8 4 8 21 26 34 36 38 39 37 36 37 41 43 39 33 36 NA 76 1 R IDEM
78 8 10 1 5 23 24 29 34 32 34 35 36 39 40 42 41 37 35 33 29 26 NA 78 1 R IDEM
80 SPN SPN LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM 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 9:00
South West - refer to the first data column for each site's specific time zone
CST12 8 10 9 12 10 10 17 25 32 36 35 40 51 44 46 44 42 41 34 26 NA NA 12 1 R IDEM
CST15 3 0 0 0 10 14 20 24 30 33 35 34 35 36 39 40 40 41 37 29 NA NA 15 1 R IDEM
CST20 6 2 4 8 7 7 15 21 29 35 36 37 35 35 36 37 38 35 37 30 NA NA 20 1 R IDEM
CST24 12 9 12 6 7 5 18 30 37 40 43 42 40 40 42 43 42 42 37 24 NA NA 24 1 R IDEM
CST33 14 5 9 11 18 14 21 26 30 33 32 33 34 35 35 36 37 36 31 26 NA NA 33 1 R IDEM
CST49 7 9 12 13 6 7 13 26 30 35 39 38 39 39 40 41 40 37 31 25 NA NA 49 1 R IDEM
CST52 2 0 4 2 9 6 14 23 31 34 33 45 43 45 48 45 44 39 31 18 NA NA 52 1 R IDEM
EST67 SPN 4 4 2 2 2 5 13 22 34 46 51 47 50 58 46 40 46 46 37 31 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 9:00
South East - all times are in EST
3 10 10 11 5 5 2 1 9 23 33 42 46 44 41 44 45 45 45 45 37 15 FEW 3 1 R IDEM
4 SPN 15 7 6 5 2 3 6 21 32 46 57 55 52 55 47 46 47 46 34 20 FEW 4 1 R IDEM
59 SPN 0 0 0 LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST NA NA 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.

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.