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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  
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Ozone Hourly Averages for Sunday, January 21, 2018.
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
North West - all times are in CST
6 13111091213898913151515 NA NA 6 1 R IDEM
13 1617171720221818141616181918 NA NA 13 1 R IDEM
16 SPN LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM NA NA 16 1 R IDEM
28 1419181718171815151515151514 NA NA 28 1 R IDEM
31 141412141714713121315161513 NA NA 31 1 R IDEM
34 1718181618202018161718171514 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
North Central - all times are in EST
5 SPN101174461319171619201816 NA 5 1 R IDEM
18 SPN1817161112161718161615181818 NA 18 1 R IDEM
21 SPN2424242322222020192122222121 NA 21 1 R IDEM
74 SPN141413131291214131415171515 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
North East - all times are in EST
7 SPN2118161711111517161819191616 NA 7 1 R IDEM
19 SPN202020191615139101517192020 NA 19 1 R IDEM
27 SPN2220201819181717171918202121 NA 27 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
West Central - refer to the first data column for each site's specific time zone
EST9 SPN1415735222325242526282827 NA 9 1 R IDEM
EST36 SPN2119191918161411141920192020 NA 36 1 R IDEM
EST37 SPN2020171722232628282828292929 NA 37 1 R IDEM
CST38 869815252727262726272727 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
East Central - all times are in EST
25 SPN2929272725262726252627282930 NA 25 1 R IDEM
40 SPN2323242519192021212324262727 NA 40 1 R IDEM
42 SPN SPN671210121315161920232525 NA 42 1 R IDEM
56 SPN1518161712172021191921232825 NA 56 1 R IDEM
60 SPN1111121716171517141821252727 NA 60 1 R IDEM
63 SPN131381019293030282828292929 NA 63 1 R IDEM
65 SPN2619171312131522222425252526 NA 65 1 R IDEM
66 SPN1514111612101622242125252626 NA 66 1 R IDEM
68 SPN2725242425232325262828282829 NA 68 1 R IDEM
71 SPN1615161716171616161416202323 NA 71 1 R IDEM
78 CAL CAL8911981012121822242728 NA 78 1 R IDEM
79 SPN2928262322161315161919192124 NA 79 1 R IDEM
80 SPN221143211432323434343535 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
South West - refer to the first data column for each site's specific time zone
CST12 3435353534313133343234343234 NA NA 12 1 R IDEM
CST15 232729175206253129313029 NA NA 15 1 R IDEM
CST24 2825242320242323263133343433 NA NA 24 1 R IDEM
CST33 3738383735333332343436353535 NA NA 33 1 R IDEM
CST49 3738383839393736373738383838 NA NA 49 1 R IDEM
CST52 3132323233323131313133333333 NA NA 52 1 R IDEM
EST67 SPN3131303133333332333334333331 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
South East - all times are in EST
3 SPN2519531007243134353535 NA 3 1 R IDEM
4 SPN2124293029282321242322293031 NA 4 1 R IDEM
59 SPN2315161215182023242529313231 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.