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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, June 12, 2021.
measured in parts per billion
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
North West - all times are in CST
6 52504533192533 FEW NA 6 1 R IDEM
13 58473040515 FEW NA 13 1 R IDEM
16 61544232262718 FEW NA 16 1 R IDEM
28 33423720172933 FEW NA 28 1 R IDEM
31 5955462171323 FEW NA 31 1 R IDEM
34 302312981329 FEW NA 34 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
North Central - all times are in EST
5 4036312722181727 FEW 5 1 R IDEM
18 3023141210121718 FEW 18 1 R IDEM
21 3527221914152127 FEW 21 1 R IDEM
74 4035282723192428 FEW 74 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
North East - all times are in EST
7 3029272520182231 FEW 7 1 R IDEM
19 3629262319192534 FEW 19 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 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 125-1-1-1-1017 FEW 9 1 R IDEM
EST36 1911181994822 FEW 36 1 R IDEM
EST37 1041000012 FEW 37 1 R IDEM
CST38 6310039 FEW NA 38 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
East Central - all times are in EST
35 2926161914161923 FEW 35 2 R IDEM
40 322319181291526 FEW 40 1 R IDEM
42 141712141371122 FEW 42 1 R IDEM
56 212218127101220 FEW 56 1 R IDEM
60 2323161316171428 FEW 60 1 R IDEM
65 3027232725201436 FEW 65 1 R IDEM
66 263526171081115 FEW 66 1 R IDEM
68 20232413871523 FEW 68 1 R IDEM
71 2627252216121422 FEW 71 1 R IDEM
76 2321191222181622 FEW 76 1 R IDEM
78 1920138741223 FEW 78 1 R IDEM
79 2936352720192834 FEW 79 1 R IDEM
80 31000004 FEW 80 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 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 75663422 FEW NA 12 1 R IDEM
CST15 93022813 FEW NA 15 1 R IDEM
CST24 20211713 LOST LOST NA NA NA 24 1 R IDEM
CST33 127424415 FEW NA 33 1 R IDEM
CST49 1515139111121 FEW NA 49 1 R IDEM
CST52 00000111 FEW NA 52 1 R IDEM
EST67 643321715 FEW 67 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
South East - all times are in EST
3 010000214 FEW 3 1 R IDEM
4 100002618 FEW 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.

Key to Ozone Highlight Colors:

Hourly ozone levels have been mapped to a set of surrogate values based on custom 1-hour breakpoints.
The table below shows the levels, color-coding, and suggested actions for the 1-hour surrogate.

Ozone levels in this range are projected to be moderate based on the one-hour surrogate calculation for Ozone.
  • Unusually sensitive individuals may experience respiratory symptoms.
  • Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion.

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.