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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, April 27, 2015.
measured in parts per billion
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
North West - all times are in CST
6 35 35 35 34 FEW NA 6 1 R IDEM
13 36 37 36 36 FEW NA 13 1 R IDEM
16 31 31 30 29 FEW NA 16 1 R IDEM
28 30 30 30 29 FEW NA 28 1 R IDEM
31 34 34 35 34 FEW NA 31 1 R IDEM
34 27 28 29 29 FEW NA 34 1 R IDEM
48 40 40 40 41 FEW NA 48 1 N IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
North Central - all times are in EST
5 31 27 25 26 27 FEW 5 1 R IDEM
18 22 21 20 20 20 FEW 18 1 R IDEM
21 25 22 21 22 24 FEW 21 1 R IDEM
74 31 28 28 27 23 FEW 74 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
North East - all times are in EST
7 28 26 23 19 17 FEW 7 1 R IDEM
19 28 25 23 22 17 FEW 19 1 R IDEM
27 22 21 20 20 18 FEW 27 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 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 SPN 23 21 20 18 FEW 9 1 R IDEM
EST36 23 22 21 19 20 FEW 36 1 R IDEM
EST37 23 19 21 18 16 FEW 37 1 R IDEM
CST38 26 24 23 25 FEW NA 38 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
East Central - all times are in EST
1 26 23 24 23 20 FEW 1 1 R IDEM
25 26 23 22 19 18 FEW 25 1 R IDEM
40 26 24 21 20 18 FEW 40 1 R IDEM
56 22 21 22 21 14 FEW 56 1 R IDEM
60 31 29 28 27 24 FEW 60 1 R IDEM
61 21 20 19 18 16 FEW 61 1 R IDEM
63 28 21 19 21 17 FEW 63 1 R IDEM
64 30 29 29 27 23 FEW 64 1 R IDEM
65 25 25 23 21 18 FEW 65 1 R IDEM
66 26 24 24 22 20 FEW 66 1 R IDEM
68 26 24 22 20 19 FEW 68 1 R IDEM
71 21 21 20 19 17 FEW 71 1 R IDEM
76 32 29 28 27 24 FEW 76 1 R IDEM
78 24 22 23 21 15 FEW 78 1 R IDEM
80 28 20 16 14 11 FEW 80 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 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 30 31 28 23 FEW NA 12 1 R IDEM
CST15 34 30 27 27 FEW NA 15 1 R IDEM
CST20 21 10 1 15 FEW NA 20 1 R IDEM
CST24 31 26 24 19 FEW NA 24 1 R IDEM
CST33 35 33 32 30 FEW NA 33 1 R IDEM
CST49 35 34 28 27 FEW NA 49 1 R IDEM
CST52 23 23 23 17 FEW NA 52 1 R IDEM
EST67 34 29 30 27 24 FEW 67 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
South East - all times are in EST
3 20 25 19 16 10 FEW 3 1 R IDEM
4 31 31 29 26 24 FEW 4 1 R IDEM
59 35 34 33 32 27 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.