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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)
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Ozone Hourly Averages for Tuesday, November 24, 2020.
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 4:00
North West - all times are in CST
6 1311111415104581111121210 FEW NA NA 6 1 R IDEM
13 141317212018128111515151312 FEW NA NA 13 1 R IDEM
16 11151922 SPZ221813141518181513 FEW NA NA 16 1 R IDEM
28 19181919181616 SPN SPN1415151312 FEW NA NA 28 1 R IDEM
31 811161920171210101314131311 FEW NA NA 31 1 R IDEM
34 15171015141514141615151515 FEW NA 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 4:00
North Central - all times are in EST
5 LIM LIM LIM LIM CAL CAL CAL LIM LIM LIM LIM SPZ LIM LIM LIM LIM NA 5 1 R IDEM
18 00000081112131212121315 FEW NA 18 1 R IDEM
21 131720201920201918171717181717 NA NA 21 1 R IDEM
74 910141276969161615161617 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 4:00
North East - all times are in EST
7 00000024565571717 FEW NA 7 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 4:00
West Central - refer to the first data column for each site's specific time zone
EST9 151517141012141112121418212427 FEW NA 9 1 R IDEM
EST36 8810111211111520161414151418 FEW NA 36 1 R IDEM
EST37 191617161416151313161719232528 FEW NA 37 1 R IDEM
CST38 13141614131313131416192225 SPN SPN 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 4:00
East Central - all times are in EST
25 61113161819202018161617171719 FEW NA 25 1 R IDEM
42 4121619171310658815182022 FEW NA 42 1 R IDEM
56 616161818171267101316182021 FEW NA 56 1 R IDEM
60 461518 FEW LOST LOST LOST LOST LOST LOST LOST LOST LOST NA NA NA 60 1 R IDEM
65 1513781314151297814171920 FEW NA 65 1 R IDEM
66 061416161687891316182121 FEW NA 66 1 R IDEM
71 LIM LIM LIM LIM LIM SPZ SPZ LIM LIM CAL CAL LOST LOST LOST NA NA NA 71 1 R IDEM
76 141818161514151514161420252728 FEW NA 76 1 R IDEM
78 4121316151385471115 SPN1921 FEW NA 78 1 R IDEM
79 3888877711131615171718 FEW NA 79 1 R IDEM
80 65581010151414161922262929 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 4:00
South West - refer to the first data column for each site's specific time zone
CST12 2121181616151616202427292931 FEW NA NA 12 1 R IDEM
CST15 1617131820181213202326272831 FEW NA NA 15 1 R IDEM
CST24 2020181717161616191923272930 FEW NA NA 24 1 R IDEM
CST33 1213161718151518202223222325 FEW NA NA 33 1 R IDEM
CST49 1413121214131315162126293131 FEW NA NA 49 1 R IDEM
CST52 1519202020201918202527272828 FEW NA NA 52 1 R IDEM
EST67 211817161819191819202225282932 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 4:00
South East - all times are in EST
3 258765105131621222326 FEW NA 3 1 R IDEM
4 131412121415131314171824272828 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.