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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 Thursday, April 18, 2019.
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 302829242014121412810121620 FEW NA 6 1 R IDEM
13 CAL3332282526251215138111723 FEW NA 13 1 R IDEM
16 CAL35333128252519151416202220 FEW NA 16 1 R IDEM
28 383634312930293629510101822 FEW NA 28 1 R IDEM
31 35343228262416852351323 FEW NA 31 1 R IDEM
34 3834323027262934301618232124 FEW 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 504442393634323237373438302220 FEW 5 1 R IDEM
18 494542393634313133343135402921 FEW 18 1 R IDEM
21 494441383632313437353440322423 FEW 21 1 R IDEM
74 514543403634313036363235322220 FEW 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 464644393736343434363739414646 FEW 7 1 R IDEM
19 495048444139383837404042444849 FEW 19 1 R IDEM
27 44 SPZ43413838342931343435394141 FEW 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 464442373329323134373940412522 FEW 9 1 R IDEM
EST36 454443403837373537384246473224 FEW 36 1 R IDEM
EST37 474542363431333435383942422422 FEW 37 1 R IDEM
CST38 4039342626273234424041 QAS QAS24 FEW 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 504646454039384138394046515248 FEW 25 1 R IDEM
40 434241403737323035353739444644 FEW 40 1 R IDEM
42 454646423830262930343743463839 FEW 42 1 R IDEM
56 474648454026252926293034454139 FEW 56 1 R IDEM
60 515052494437293631363945514645 FEW 60 1 R IDEM
63 525150474138353739404144454445 FEW 63 1 R IDEM
65 444239393835302834363843434340 FEW 65 1 R IDEM
66 SPZ4547453734263134353641424043 FEW 66 1 R IDEM
68 504444424442363436384047495047 FEW 68 1 R IDEM
71 494746464537303134333642444241 FEW 71 1 R IDEM
76 515048484540363842434450525150 FEW 76 1 R IDEM
78 484848454133293035374046464143 FEW 78 1 R IDEM
79 47454341 FEW LOST LOST LOST LOST LOST LOST LOST LOST NA NA NA 79 1 R IDEM
80 565450494443424040444449504747 FEW 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 4239373540413835353737333835 FEW NA 12 1 R IDEM
CST15 4338373638353233343234363738 FEW NA 15 1 R IDEM
CST24 4443383737343131313131363838 FEW NA 24 1 R IDEM
CST33 4643403737393938353636404241 FEW NA 33 1 R IDEM
CST49 5148464544444344464748484642 FEW NA 49 1 R IDEM
CST52 4431383538373631333533343036 FEW NA 52 1 R IDEM
EST67 SPZ SPZ LIM LIM LIM LIM LIM LIM LIM CAL CAL CAL404144 FEW 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 474546464542383338475050494947 FEW 3 1 R IDEM
4 484544434139394041475151505350 FEW 4 1 R IDEM
59 333434333230282930313235373532 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.

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.