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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.
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Ozone Highlights:  Moderate   Unhealthy for Sensitives   Unhealthy   Very Unhealthy  
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Ozone Hourly Averages for Friday, February 26, 2021.
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
North West - all times are in CST
6 22112391825313538414141404238 FEW NA NA 6 1 R IDEM
13 2143992112127353941434444444138 FEW NA NA 13 1 R IDEM
16 2108713232933384042454545444240 FEW NA NA 16 1 R IDEM
28 006141221192124323740434445434039 FEW NA NA 28 1 R IDEM
31 0111211171931383940434445464437 FEW NA NA 31 1 R IDEM
34 1347142019221520313640424242414040 FEW 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
North Central - all times are in EST
5 00000001618263334374041393735 FEW NA 5 1 R IDEM
18 321221132428303133323437393837 FEW NA 18 1 R IDEM
21 23212020202124272932353839404142434240 FEW NA 21 1 R IDEM
74 1311784224813283536383940393737 FEW 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
North East - all times are in EST
7 100000261525303337383938383641 FEW NA 7 1 R IDEM
19 8832433132126313235384040393737 FEW NA 19 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
West Central - refer to the first data column for each site's specific time zone
EST9 LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST CAL CAL CAL383938373634 FEW NA 9 1 R IDEM
EST36 23171719232730313434353637404241373234 FEW NA 36 1 R IDEM
EST37 35342826262628303132353740414241 FEW3836 FEW NA 37 1 R IDEM
CST38 251821242415202128313639404038353432 FEW 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
East Central - all times are in EST
35 20191313213231323233353637404142413937 FEW NA 35 2 R IDEM
40 612252130303233343434353939373634 FEW NA 40 1 R IDEM
42 28232117252324242627303336363738383231 FEW NA 42 1 R IDEM
56 33292824232525242326293134363536373334 FEW NA 56 1 R IDEM
60 3229312323 CAL CAL272830323437393941363024 FEW NA 60 1 R IDEM
65 29313232313030302727293234353535353229 FEW NA 65 1 R IDEM
66 2522221920152162225283134343335343233 FEW NA 66 1 R IDEM
68 18211816232425262627303234363737353333 FEW NA 68 1 R IDEM
71 21141514121821232728303133353738383634 FEW NA 71 1 R IDEM
76 3431290 FEW SPZ32323433363739403938373534 FEW NA 76 1 R IDEM
78 13856132025272528303235363637363232 FEW NA 78 1 R IDEM
79 830282629323231333637393937363531 FEW NA 79 1 R IDEM
80 111088775133033343538383939373533 FEW 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
South West - refer to the first data column for each site's specific time zone
CST12 282732303030303133333334343229272726 FEW NA NA 12 1 R IDEM
CST15 30282930 SPN29272831333334333024242223 FEW NA NA 15 1 R IDEM
CST33 303029303029292931313232272730 FEW2725 FEW NA NA 33 1 R IDEM
CST49 333130303031313233343432323030302928 FEW NA NA 49 1 R IDEM
CST52 322930313030333334343535353433322827 FEW NA NA 52 1 R IDEM
EST67 37373533333535333537394040414139383735 FEW 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
South East - all times are in EST
3 6737212223203034353434323433272421 FEW NA 3 1 R IDEM
4 31353229313133373839393838383836 FEW3127 FEW NA 4 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.