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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, October 23, 2017.
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 41363534333537313841444641292014 NA NA 6 1 R IDEM
13 45464239403735363840435251484534 NA NA 13 1 R IDEM
16 QAS QAS QAS QAS QAS QAS QAS QAS QAS42454848464537 NA NA 16 1 R IDEM
28 36353536384237343735394146443832 NA NA 28 1 R IDEM
31 4442373733333435383842504645257 NA NA 31 1 R IDEM
34 31252727293340394039384047504541 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 2628252218161512101521212123253140 NA 5 1 R IDEM
18 2117161410312101313131312152226 NA 18 1 R IDEM
21 SPZ SPZ LIM LIM LIM LIM LIM LIM LIM LIM LIM CAL CAL CAL374546 NA 21 1 R IDEM
74 252524221713141071017202021252933 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 3936343332312823171923242625292316 NA 7 1 R IDEM
19 3629302828262724192122242527282717 NA 19 1 R IDEM
27 3533312927262722182222232425241621 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 42212725231914111417172033413832 NA 9 1 R IDEM
EST37 65212623232321141017202030403733 NA 37 1 R IDEM
CST38 SPZ242523151114151819202226293027 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
1 SPZ32302724222019201825252414132429 NA 1 1 R IDEM
25 36 SPZ333233302726242425252827181928 NA 25 1 R IDEM
40 3534343435322925252625243033291924 NA 40 1 R IDEM
42 3331292824232019201722222010162533 NA 42 1 R IDEM
56 3433322927252018211720192112182636 NA 56 1 R IDEM
60 3433312928272322222027272716162830 NA 60 1 R IDEM
63 3128242023242115151523181212152837 NA 63 1 R IDEM
64 3433333229272425232730282118151426 NA 64 1 R IDEM
65 2927242321221918171319221626272934 NA 65 1 R IDEM
68 3534323124222323232329283021181625 NA 68 1 R IDEM
71 3535333029282422212122272720263136 NA 71 1 R IDEM
76 3533323230272324232427262919161513 NA 76 1 R IDEM
78 292727282624212020192424199111422 NA 78 1 R IDEM
80 SPZ31222225262624222427231816151423 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 25242314131417181918192122222527 NA NA 12 1 R IDEM
CST15 SPZ LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM NA NA 15 1 R IDEM
CST20 23222113111215151514141618192226 NA NA 20 1 R IDEM
CST24 SPZ221614161819191819202222242628 NA NA 24 1 R IDEM
CST33 28191620202121212022242426283032 NA NA 33 1 R IDEM
CST49 31302725252019221512151616202121 NA NA 49 1 R IDEM
CST52 2120178101217171818202221222526 NA NA 52 1 R IDEM
EST67 SPN27272525232116121213141416203736 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 2526241112172621161516232015161919 NA 3 1 R IDEM
4 3533292727243233242122202016151718 NA 4 1 R IDEM
59 3031313025272419182526211615141312 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.