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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.
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Ozone Highlights:  Moderate   Unhealthy for Sensitives   Unhealthy   Very Unhealthy  
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Ozone Hourly Averages for Thursday, October 17, 2019.
measured in parts per billion
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00
North West - all times are in CST
6 12000003 FEW NA NA NA 6 1 R IDEM
13 1920202020191920 FEW NA NA NA 13 1 R IDEM
16 2019182020181818 FEW NA NA NA 16 1 R IDEM
28 005411141516 FEW NA NA NA 28 1 R IDEM
31 21419191918174 FEW NA NA NA 31 1 R IDEM
34 1817181719191919 FEW NA NA NA 34 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00
North Central - all times are in EST
5 212020181819161819 FEW NA NA 5 1 R IDEM
18 191312171616181618 FEW NA NA 18 1 R IDEM
21 221715151414181919 FEW NA NA 21 1 R IDEM
74 242423222020201818 FEW NA NA 74 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00
North East - all times are in EST
7 151313121283611 FEW NA NA 7 1 R IDEM
19 242323221913121113 FEW NA NA 19 1 R IDEM
27 1615151614107710 FEW NA NA 27 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00
West Central - refer to the first data column for each site's specific time zone
EST9 1414121188779 FEW NA NA 9 1 R IDEM
EST36 12108766437 FEW NA NA 36 1 R IDEM
EST37 13141111988810 FEW NA NA 37 1 R IDEM
CST38 141313121191011 FEW NA NA NA 38 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00
East Central - all times are in EST
25 19181614129779 FEW NA NA 25 1 R IDEM
40 23 SPZ19171412111114 FEW NA NA 40 1 R IDEM
42 19 SPZ16141162 LOST LOST NA NA NA 42 1 R IDEM
56 1815141183227 FEW NA NA 56 1 R IDEM
60 1917151411108710 FEW NA NA 60 1 R IDEM
63 12109965347 FEW NA NA 63 1 R IDEM
65 1615141154439 FEW NA NA 65 1 R IDEM
66 2018161310109810 FEW NA NA 66 1 R IDEM
68 171513121110558 FEW NA NA 68 1 R IDEM
71 19171615141311910 FEW NA NA 71 1 R IDEM
76 1817171613108911 FEW NA NA 76 1 R IDEM
78 CAL CAL12951103 FEW NA NA 78 1 R IDEM
79 15151412108556 FEW NA NA 79 1 R IDEM
80 1054332228 FEW NA NA 80 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00
South West - refer to the first data column for each site's specific time zone
CST12 CAL5331018 FEW NA NA NA 12 1 R IDEM
CST15 23787639 FEW NA NA NA 15 1 R IDEM
CST24 10131312109913 FEW NA NA NA 24 1 R IDEM
CST33 1089866710 FEW NA NA NA 33 1 R IDEM
CST49 1312131186610 FEW NA NA NA 49 1 R IDEM
CST52 43210006 FEW NA NA NA 52 1 R IDEM
EST67 16131311106137 NA NA NA 67 1 R IDEM
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00
South East - all times are in EST
3 151515141210879 FEW NA NA 3 1 R IDEM
4 1313131198227 FEW NA NA 4 1 R IDEM
59 10171515141310811 FEW NA NA 59 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.