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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, April 20, 2014.
measured in parts per billion
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00
North West - all times are in CST
6 33 32 30 28 30 28 FEW NA 6 1 R IDEM
13 40 39 36 37 39 36 FEW NA 13 1 R IDEM
16 42 43 43 42 41 39 FEW NA 16 1 R IDEM
28 38 38 39 38 36 36 FEW NA 28 1 R IDEM
31 37 36 35 35 38 36 FEW NA 31 1 R IDEM
34 34 36 32 31 30 30 FEW NA 34 1 R IDEM
48 26 31 33 31 26 33 FEW NA 48 1 N IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00
North Central - all times are in EST
5 SPN 36 36 33 34 32 33 FEW 5 1 R IDEM
18 SPN 35 32 32 32 31 28 FEW 18 1 R IDEM
21 SPN 40 40 38 37 35 36 FEW 21 1 R IDEM
74 SPN 43 42 40 38 37 36 FEW 74 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00
North East - all times are in EST
7 SPN 35 34 31 30 26 24 FEW 7 1 R IDEM
19 SPN 36 33 32 30 26 24 FEW 19 1 R IDEM
27 SPN 34 33 32 28 22 22 FEW 27 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00
West Central - refer to the first data column for each site's specific time zone
EST9 19 16 15 18 15 9 7 FEW 9 1 R IDEM
EST36 SPZ 31 30 28 25 24 22 FEW 36 1 R IDEM
EST37 SPN 32 31 31 31 29 20 FEW 37 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00
East Central - all times are in EST
1 SPN 33 30 30 29 29 23 FEW 1 1 R IDEM
25 SPN 30 28 26 24 26 30 FEW 25 1 R IDEM
40 SPN 27 25 26 25 24 26 FEW 40 1 R IDEM
42 39 37 35 33 31 28 21 FEW 42 1 R IDEM
56 38 35 33 30 31 28 31 FEW 56 1 R IDEM
60 39 38 37 34 31 28 25 FEW 60 1 R IDEM
61 SPN 24 27 27 26 28 26 FEW 61 1 R IDEM
63 44 40 39 37 33 31 34 FEW 63 1 R IDEM
64 SPN 26 23 23 23 23 22 FEW 64 1 R IDEM
65 SPN 34 34 34 34 33 32 FEW 65 1 R IDEM
66 SPN 35 33 30 29 28 12 FEW 66 1 R IDEM
68 SPN 27 25 23 24 26 24 FEW 68 1 R IDEM
76 SPN 37 38 35 32 30 27 FEW 76 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00
South West - refer to the first data column for each site's specific time zone
CST12 31 23 21 16 18 22 FEW NA 12 1 R IDEM
CST15 16 17 19 19 17 10 FEW NA 15 1 R IDEM
CST20 49 44 34 21 30 23 FEW NA 20 1 R IDEM
CST24 53 53 51 48 40 42 FEW NA 24 1 R IDEM
CST33 46 45 42 44 39 32 FEW NA 33 1 R IDEM
CST49 50 47 44 44 43 41 FEW NA 49 1 R IDEM
CST52 38 31 31 23 22 15 FEW NA 52 1 R IDEM
EST67 SPN 40 34 32 32 32 25 FEW 67 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00
South East - all times are in EST
3 SPN 25 23 22 19 14 10 FEW 3 1 R IDEM
4 SPN 46 44 38 37 37 33 FEW 4 1 R IDEM
59 SPN 26 25 19 18 16 15 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.

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.