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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 Monday, September 20, 2021.
measured in parts per billion
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
North West - all times are in CST
6 34302626 FEW NA 6 1 R IDEM
13 37343229 FEW NA 13 1 R IDEM
16 39383633 FEW NA 16 1 R IDEM
28 38333028 FEW NA 28 1 R IDEM
31 28292523 FEW NA 31 1 R IDEM
34 34312827 FEW NA 34 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
North Central - all times are in EST
5 4239363229 FEW 5 1 R IDEM
18 4137333027 FEW 18 1 R IDEM
21 3638363530 NA 21 1 R IDEM
74 4239353228 FEW 74 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
North East - all times are in EST
7 3128252218 FEW 7 1 R IDEM
19 3128252419 FEW 19 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
West Central - refer to the first data column for each site's specific time zone
EST9 1515161517 FEW 9 1 R IDEM
EST36 2422141215 FEW 36 1 R IDEM
EST37 LIM LIM LIM LIM LIM LIM 37 1 R IDEM
CST38 881010 FEW NA 38 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
East Central - all times are in EST
35 2729251917 FEW 35 2 R IDEM
40 2423231913 FEW 40 1 R IDEM
42 LIM LIM LIM LIM LIM LIM 42 1 R IDEM
56 2422181712 FEW 56 1 R IDEM
60 2522191714 FEW 60 1 R IDEM
65 2724211817 FEW 65 1 R IDEM
66 2115171515 FEW 66 1 R IDEM
68 201813812 FEW 68 1 R IDEM
71 2622181412 NA 71 1 R IDEM
76 1277 FEW NA NA 76 1 R IDEM
78 2520151212 FEW 78 1 R IDEM
79 3429252217 FEW 79 1 R IDEM
80 131471113 FEW 80 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
South West - refer to the first data column for each site's specific time zone
CST12 17181514 FEW NA 12 1 R IDEM
CST15 15141311 FEW NA 15 1 R IDEM
CST24 10141311 FEW NA 24 1 R IDEM
CST33 14121112 FEW NA 33 1 R IDEM
CST49 21201918 FEW NA 49 1 R IDEM
CST52 15151311 FEW NA 52 1 R IDEM
EST67 1719232222 FEW 67 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
South East - all times are in EST
3 001812 FEW 3 1 R IDEM
4 2271114 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.