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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 Saturday, May 8, 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
North West - all times are in CST
6 35343534333333333233343435 FEW NA NA 6 1 R IDEM
13 37363636353535353535353535 FEW NA NA 13 1 R IDEM
16 37363636353535353534343534 FEW NA NA 16 1 R IDEM
28 21181920141931323434353534 FEW NA NA 28 1 R IDEM
34 26181814151528333434343435 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
North Central - all times are in EST
5 2624252417121624313233343434 FEW NA 5 1 R IDEM
18 262422191791223272828303131 FEW NA 18 1 R IDEM
21 2319211820171624303333343535 FEW NA 21 1 R IDEM
74 2826222123182229323334353535 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
North East - all times are in EST
7 2725232219162025293131323334 FEW NA 7 1 R IDEM
19 2927242320192226302100036 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
West Central - refer to the first data column for each site's specific time zone
EST9 2924161383419283034363840 FEW NA 9 1 R IDEM
EST36 2927242225232228313435363838 FEW NA 36 1 R IDEM
EST37 3230252120191520303235363841 FEW NA 37 1 R IDEM
CST38 26202022182226323437394041 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
East Central - all times are in EST
35 3030292522192528323435363739 FEW NA 35 2 R IDEM
40 3230292724182327313334353738 FEW NA 40 1 R IDEM
42 3230272318181224293234373941 FEW NA 42 1 R IDEM
56 29272421201813222731333637 FEW NA NA 56 1 R IDEM
60 33312927242019 LOST LOST LOST LOST LOST LOST NA NA NA 60 1 R IDEM
65 2725252323232326293234363739 FEW NA 65 1 R IDEM
66 2827262523201624283133353739 FEW NA 66 1 R IDEM
68 3029262623212025283133353739 FEW NA 68 1 R IDEM
71 323129252420 SPZ LOST LOST LOST LOST LOST LOST NA NA NA 71 1 R IDEM
76 LIM LIM LIM LIM LIM SPZ SPZ LIM LIM LIM LIM LIM LIM LIM LIM NA 76 1 R IDEM
79 3130292724212328313435373839 FEW NA 79 1 R IDEM
80 221712141110817283135383940 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
South West - refer to the first data column for each site's specific time zone
CST12 37373532302931323235343536 FEW NA NA 12 1 R IDEM
CST15 40383634322929313233303030 FEW NA NA 15 1 R IDEM
CST24 40383634323132323233343433 FEW NA NA 24 1 R IDEM
CST33 39383634323030313231293031 FEW NA NA 33 1 R IDEM
CST49 33353331292730323438414037 FEW NA NA 49 1 R IDEM
CST52 36343129292629323335343537 FEW NA NA 52 1 R IDEM
EST67 3736322825261925333436394141 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
South East - all times are in EST
3 3937363326181429323435384143 FEW NA 3 1 R IDEM
4 3531312726242526313436373840 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.