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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 Thursday, July 9, 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 5:00 6:00 7:00
North West - all times are in CST
6 2527232219222730384758585557565656 FEW NA NA 6 1 R IDEM
13 212718149182933384757606363616158 FEW NA NA 13 1 R IDEM
16 2426252220243743435157616573717169 FEW NA NA 16 1 R IDEM
28 1920212012133435404753586159595957 FEW NA NA 28 1 R IDEM
31 16211615481923344056636565625654 FEW NA NA 31 1 R IDEM
34 211512128142127273943525658585859 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 6:00 7:00
North Central - all times are in EST
5 252418131414193041445257586061586061 FEW NA 5 1 R IDEM
18 21161051081418325055575956565858 FEW NA 18 1 R IDEM
21 2321191199182637444654565858616161 FEW NA 21 1 R IDEM
74 13131063251832475761626257485162 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 6:00 7:00
North East - all times are in EST
7 1514500032141556063616264646563 FEW NA 7 1 R IDEM
19 912610 CAL CAL3041495761646462585562 FEW NA 19 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 6:00 7:00
West Central - refer to the first data column for each site's specific time zone
EST9 1515985361529425256656760545856 FEW NA 9 1 R IDEM
EST36 128221072431354656585754545653 FEW NA 36 1 R IDEM
EST37 116652111333425362677263535154 FEW NA 37 1 R IDEM
CST38 3322011022334252515357596656 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 6:00 7:00
East Central - all times are in EST
25 23138665122134444950515053515252 FEW NA 25 1 R IDEM
40 1711764552237515762596059586062 FEW NA 40 1 R IDEM
42 1310963141229 QAS5762615750474848 FEW NA 42 1 R IDEM
56 8265004712324448474442434548 FEW NA 56 1 R IDEM
60 1510632141329425561635754524645 FEW NA 60 1 R IDEM
65 221718201411131529415862646058555352 FEW NA 65 1 R IDEM
66 1613136200629445052515348514645 FEW NA 66 1 R IDEM
68 178643091931465456555562565250 FEW NA 68 1 R IDEM
71 22181485351324415965657172615556 FEW NA 71 1 R IDEM
76 1610452241934485556555660646548 FEW NA 76 1 R IDEM
78 9151-1-121326395460585246434647 FEW NA 78 1 R IDEM
79 796410172737465356606681716757 FEW NA 79 1 R IDEM
80 00-1-1-1-10529364242403843464640 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 6:00 7:00
South West - refer to the first data column for each site's specific time zone
CST12 15842231329404559585353504446 FEW NA NA 12 1 R IDEM
CST15 9743131020375152494959495140 FEW NA NA 15 1 R IDEM
CST24 131385351533414850534851605049 FEW NA NA 24 1 R IDEM
CST33 141696451328364559484643454239 FEW NA NA 33 1 R IDEM
CST49 151454561030444948454343434240 FEW NA NA 49 1 R IDEM
CST52 7300011028423747535147384148 FEW NA NA 52 1 R IDEM
EST67 17111022031632435060625054565762 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 6:00 7:00
South East - all times are in EST
3 86525131231466059628468544945 FEW NA 3 1 R IDEM
4 85132011028455656565054484434 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.

Key to Ozone Highlight Colors:

Hourly ozone levels have been mapped to a set of surrogate values based on custom 1-hour breakpoints.
The table below shows the levels, color-coding, and suggested actions for the 1-hour surrogate.

Ozone levels in this range are projected to be moderate based on the one-hour surrogate calculation for Ozone.
  • Unusually sensitive individuals may experience respiratory symptoms.
  • Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion.
Ozone levels in this range are projected to be unhealthy for sensitive groups based on the one-hour surrogate calculation for Ozone.
  • Increasing likelihood of respiratory symptoms and breathing discomfort in active children and adults and people with respiratory disease, such as asthma.
  • Active children, the elderly, and people with lung disease, such as asthma, should reduce prolonged or heavy outdoor exertion.

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.