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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 Wednesday, September 23, 2020.
measured in parts per billion
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00
North West - all times are in CST
6 121110 FEW NA 6 1 R IDEM
13 175 FEW NA 13 1 R IDEM
16 232320 FEW NA 16 1 R IDEM
28 272930 FEW NA 28 1 R IDEM
31 589 FEW NA 31 1 R IDEM
34 8127 FEW NA 34 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00
North Central - all times are in EST
5 442122 FEW 5 1 R IDEM
18 1212105 FEW 18 1 R IDEM
21 13182219 FEW 21 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00
North East - all times are in EST
7 21232221 FEW 7 1 R IDEM
19 68109 FEW 19 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00
West Central - refer to the first data column for each site's specific time zone
EST9 1000 FEW 9 1 R IDEM
EST36 22201716 FEW 36 1 R IDEM
EST37 10663 FEW 37 1 R IDEM
CST38 643 FEW NA 38 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00
East Central - all times are in EST
25 20201611 FEW 25 1 R IDEM
42 610106 FEW 42 1 R IDEM
56 13912 FEW 56 1 R IDEM
65 32312827 FEW 65 1 R IDEM
66 30131215 FEW 66 1 R IDEM
68 3025312 FEW 68 1 R IDEM
76 161398 FEW 76 1 R IDEM
78 191581 FEW 78 1 R IDEM
79 32312929 FEW 79 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00
South West - refer to the first data column for each site's specific time zone
CST12 LIM LIM LIM LIM NA 12 1 R IDEM
CST15 200 FEW NA 15 1 R IDEM
CST24 121210 FEW NA 24 1 R IDEM
CST33 454 FEW NA 33 1 R IDEM
CST49 161814 FEW NA 49 1 R IDEM
CST52 223 FEW NA 52 1 R IDEM
EST67 8632 FEW 67 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00
South East - all times are in EST
3 2020158 FEW 3 1 R IDEM
4 8700 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.

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.