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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 Monday, January 20, 2020.
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 9:0010:00
North West - refer to the first data column for each site's specific time zone
CST6 76787200254566818393736 FEW NA NA NA 6 1 R IDEM
EST13 2065652000131021262524199519 FEW NA NA 13 1 R IDEM
CST16 107763223619323440372930262427 FEW NA NA NA 16 1 R IDEM
CST28 1212121110963716272830332825232525 FEW NA NA NA 28 1 R IDEM
CST31 6911831113482123282073329 FEW NA NA NA 31 1 R IDEM
CST34 000001151324333335363634302626 FEW NA 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 9:0010:00
North Central - all times are in EST
5 111120001514263232313233322928 FEW NA NA 5 1 R IDEM
18 220000001311253234363535322728 FEW NA NA 18 1 R IDEM
21 1817141212119981020353940403940383532 FEW NA NA 21 1 R IDEM
74 000000000616273032323131323130 FEW NA 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 9:0010:00
North East - all times are in EST
7 151415131283272233384141414241393837 FEW NA NA 7 1 R IDEM
19 1414151517171412112234414344444443434241 FEW NA 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 9:0010:00
West Central - refer to the first data column for each site's specific time zone
EST9 1918191818171616161717181820222219181616 FEW NA NA 9 1 R IDEM
EST36 2121191716161617151516171922272827272625 FEW NA NA 36 1 R IDEM
EST37 2423222121212122212021212224252523201921 FEW NA NA 37 1 R IDEM
CST38 23232120201919192020212223232424232222 FEW NA 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 9:0010:00
East Central - all times are in EST
25 2322222220191816161719202430343434363431 FEW NA NA 25 1 R IDEM
40 222120181616129101418233031353837383636 FEW NA NA 40 1 R IDEM
42 252423222221 SPZ18161819212328333436343335 FEW NA NA 42 1 R IDEM
56 2223222120191812121316172022252929272528 FEW NA NA 56 1 R IDEM
60 2222222120191816161617182329333534333333 FEW NA NA 60 1 R IDEM
65 2322212020181614141716172230323232302928 FEW NA NA 65 1 R IDEM
66 2324232222211916141819202126282828292928 FEW NA NA 66 1 R IDEM
68 1919202021191920181919212327303130303129 FEW NA NA 68 1 R IDEM
71 2322212019191512111518202531343334343231 FEW NA NA 71 1 R IDEM
76 2222232222222525232325262628293030292932 FEW NA NA 76 1 R IDEM
78 21202119171512106911121517191918171818 FEW NA NA 78 1 R IDEM
79 21201918161514971115182530323331312925 FEW NA NA 79 1 R IDEM
80 2221212122222425252526262831323029282422 FEW NA 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 9:0010:00
South West - refer to the first data column for each site's specific time zone
CST12 24232221212121202020192124272624272623 FEW NA NA NA 12 1 R IDEM
CST15 25252422192221182223232425262726262522 FEW NA NA NA 15 1 R IDEM
CST24 23232221202120202020212324252626242120 FEW NA NA NA 24 1 R IDEM
CST33 LIM LIM LIM LIM SPZ SPZ LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM NA NA NA 33 1 R IDEM
CST49 23242525242323262525252525262628282726 FEW NA NA NA 49 1 R IDEM
CST52 25252423222221212222232324242727252725 FEW NA NA NA 52 1 R IDEM
EST67 2423232221202020242525262628282928262422 FEW NA 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 9:0010:00
South East - all times are in EST
3 2424242423242424242424242526262725252222 FEW NA NA 3 1 R IDEM
4 LIM LIM LIM LIM LIM SPZ SPZ LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM NA 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.