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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  
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Ozone Hourly Averages for Monday, June 24, 2019.
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 5:00
North West - all times are in CST
6 232222212021212528262833273037 FEW NA NA 6 1 R IDEM
13 252620191518232529323029273037 FEW NA NA 13 1 R IDEM
16 313027242123273233383634313034 FEW NA NA 16 1 R IDEM
28 312825232323272932363532323338 FEW NA NA 28 1 R IDEM
31 211920211922232629302825242937 FEW NA NA 31 1 R IDEM
34 282623201821232629333230282932 FEW 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 5:00
North Central - all times are in EST
5 27302825211821263031363735353233 FEW NA 5 1 R IDEM
18 30282622201716202731323535313434 FEW NA 18 1 R IDEM
21 26272420171517222426313230292728 FEW NA 21 1 R IDEM
74 26292724211716242932363836353132 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 5:00
North East - all times are in EST
7 2423201719232325 QAS QAS383940383940 FEW NA 7 1 R IDEM
19 27252321182125273339434444444344 FEW NA 19 1 R IDEM
27 24211920222322242730343535343537 FEW NA 27 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 5:00
West Central - refer to the first data column for each site's specific time zone
EST9 32323031282425252729303033394141 FEW NA 9 1 R IDEM
EST36 26222127323231313334353939394245 FEW NA 36 1 R IDEM
EST37 29332830282421242729302931384139 FEW NA 37 1 R IDEM
CST38 323129252423262529333337424646 FEW 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 5:00
East Central - all times are in EST
25 27283027262525272933363436373843 FEW NA 25 1 R IDEM
40 SPZ SPZ LIM LIM LIM LIM LIM LIM LIM CAL CAL CAL CAL343537 FEW NA 40 1 R IDEM
42 25272725241815212528222323243740 FEW NA 42 1 R IDEM
56 23242320201215212527222524283641 FEW NA 56 1 R IDEM
60 27293028282522242631303130294048 FEW NA 60 1 R IDEM
63 SPZ SPZ LIM LIM LIM LIM LIM PM LIM LIM LIM LIM LIM LIM LIM LIM LIM NA 63 1 R IDEM
65 22253031332928313132333434354847 FEW NA 65 1 R IDEM
66 SPZ283027262424262629272829313944 FEW NA 66 1 R IDEM
68 26242323212121242635343537373744 FEW NA 68 1 R IDEM
71 27282930302625283233323030323948 FEW NA 71 1 R IDEM
76 27252321222325272928333536384043 FEW NA 76 1 R IDEM
78 26282828262017202527262526253741 FEW NA 78 1 R IDEM
79 27242326292930333636363739384144 FEW NA 79 1 R IDEM
80 32302412102324262929283034364348 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 5:00
South West - refer to the first data column for each site's specific time zone
CST12 262731323134343131333641515050 FEW NA NA 12 1 R IDEM
CST15 252829273128262827293447444643 FEW NA NA 15 1 R IDEM
CST24 303230312931272828313649454444 FEW NA NA 24 1 R IDEM
CST33 343433333432343635344450515044 FEW NA NA 33 1 R IDEM
CST49 2424252424242327 QAS QAS2929393944 FEW NA NA 49 1 R IDEM
CST52 262932333334322820303740484747 FEW NA NA 52 1 R IDEM
EST67 33322929292828293133353842474949 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 5:00
South East - all times are in EST
3 913161716710192022242215193037 FEW NA 3 1 R IDEM
4 17131218131211182125272318202735 FEW NA 4 1 R IDEM
59 25252525252425262731323636363943 FEW 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.