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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 Thursday, May 5, 2016.
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 23 22 22 21 NA NA 6 1 R IDEM
13 22 21 21 20 NA NA 13 1 R IDEM
28 20 20 19 18 NA NA 28 1 R IDEM
31 22 22 21 21 NA NA 31 1 R IDEM
34 17 17 15 16 NA NA 34 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
North Central - all times are in EST
5 SPZ SPZ LIM LIM LIM NA 5 1 R IDEM
18 19 18 19 19 29 NA 18 1 R IDEM
74 19 19 18 20 22 NA 74 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
North East - all times are in EST
7 17 16 15 14 12 NA 7 1 R IDEM
19 16 15 16 15 14 NA 19 1 R IDEM
27 SPZ SPZ LIM LIM LIM NA 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 25 26 25 22 22 NA 9 1 R IDEM
EST36 SPZ 22 22 21 20 NA 36 1 R IDEM
EST37 24 25 24 21 20 NA 37 1 R IDEM
CST38 SPZ 26 24 23 NA 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 24 23 20 18 16 NA 1 1 R IDEM
25 25 24 22 20 18 NA 25 1 R IDEM
40 22 21 19 18 17 NA 40 1 R IDEM
42 26 24 22 20 18 NA 42 1 R IDEM
56 SPZ 24 21 18 15 NA 56 1 R IDEM
60 26 25 22 20 19 NA 60 1 R IDEM
63 26 27 24 20 19 NA 63 1 R IDEM
64 25 27 25 22 19 NA 64 1 R IDEM
65 25 23 20 20 20 NA 65 1 R IDEM
66 27 26 22 20 19 NA 66 1 R IDEM
68 24 25 22 20 17 NA 68 1 R IDEM
71 22 21 18 17 16 NA 71 1 R IDEM
76 29 27 27 25 23 NA 76 1 R IDEM
78 25 23 20 17 13 NA 78 1 R IDEM
80 18 18 18 16 14 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 26 25 27 25 NA NA 12 1 R IDEM
CST15 31 26 26 29 NA NA 15 1 R IDEM
CST20 25 27 26 26 NA NA 20 1 R IDEM
CST24 29 29 26 24 NA NA 24 1 R IDEM
CST33 23 27 27 28 FEW NA 33 1 R IDEM
CST49 25 24 21 18 NA NA 49 1 R IDEM
CST52 30 29 29 28 NA NA 52 1 R IDEM
EST67 26 27 26 27 25 NA 67 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
South East - all times are in EST
3 16 9 15 22 22 NA 3 1 R IDEM
4 25 26 25 19 24 NA 4 1 R IDEM
59 SPZ 28 27 27 24 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.