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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 Wednesday, April 23, 2014.
measured in parts per billion
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
North West - all times are in CST
6 30 28 31 32 33 35 FEW NA NA 6 1 R IDEM
13 41 40 40 43 44 44 FEW NA NA 13 1 R IDEM
16 39 39 39 41 42 42 FEW NA NA 16 1 R IDEM
28 40 38 39 40 41 40 FEW NA NA 28 1 R IDEM
31 37 33 34 39 41 42 FEW NA NA 31 1 R IDEM
34 SPZ 31 33 34 33 31 FEW NA NA 34 1 R IDEM
48 39 38 40 42 42 43 FEW NA NA 48 1 N IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
North Central - all times are in EST
5 36 35 36 35 32 30 28 FEW NA 5 1 R IDEM
18 31 28 27 26 28 25 26 FEW NA 18 1 R IDEM
21 30 26 32 31 32 30 28 FEW NA 21 1 R IDEM
74 36 34 33 31 28 27 29 FEW NA 74 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
North East - all times are in EST
7 SPZ 36 35 34 33 29 29 FEW NA 7 1 R IDEM
19 36 35 33 32 30 29 31 FEW NA 19 1 R IDEM
27 29 30 29 27 27 28 26 LIM NA 27 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
West Central - refer to the first data column for each site's specific time zone
EST9 34 35 33 32 30 27 25 FEW NA 9 1 R IDEM
EST36 SPZ 33 30 28 25 25 25 FEW NA 36 1 R IDEM
EST37 35 36 35 36 32 26 27 FEW NA 37 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
East Central - all times are in EST
1 37 SPZ 36 34 32 29 27 FEW NA 1 1 R IDEM
25 30 28 31 28 25 22 18 FEW NA 25 1 R IDEM
40 32 30 29 28 27 25 24 FEW NA 40 1 R IDEM
42 40 38 37 38 35 32 30 FEW NA 42 1 R IDEM
56 36 34 36 31 24 18 18 FEW NA 56 1 R IDEM
60 40 37 37 37 34 32 30 FEW NA 60 1 R IDEM
61 SPZ 31 31 29 27 26 22 FEW NA 61 1 R IDEM
63 SPN 40 36 37 35 23 31 FEW NA 63 1 R IDEM
64 SPZ 32 30 25 27 28 20 FEW NA 64 1 R IDEM
65 29 30 32 29 27 27 28 FEW NA 65 1 R IDEM
66 35 33 34 33 29 23 23 FEW NA 66 1 R IDEM
68 26 29 29 30 26 23 22 FEW NA 68 1 R IDEM
71 32 30 31 32 29 26 25 FEW NA 71 1 R IDEM
76 33 34 36 37 35 32 31 FEW NA 76 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
South West - refer to the first data column for each site's specific time zone
CST12 18 34 36 35 33 34 FEW NA NA 12 1 R IDEM
CST15 13 17 32 33 34 31 FEW NA NA 15 1 R IDEM
CST20 32 31 30 24 34 32 FEW NA NA 20 1 R IDEM
CST24 35 36 34 35 34 32 FEW NA NA 24 1 R IDEM
CST33 24 18 28 31 32 31 FEW NA NA 33 1 R IDEM
CST49 42 42 41 40 39 40 FEW NA NA 49 1 R IDEM
CST52 6 11 24 25 22 23 FEW NA NA 52 1 R IDEM
EST67 35 SPZ 35 35 35 35 33 FEW NA 67 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
South East - all times are in EST
3 40 39 38 41 39 29 27 FEW NA 3 1 R IDEM
4 42 41 38 39 35 31 31 FEW NA 4 1 R IDEM
59 29 28 35 37 36 37 31 FEW 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.

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.