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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 Tuesday, September 17, 2019.
measured in parts per billion
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 8:00 9:0010:00
Clark County - all times are in PST
22  1 SPN46454136353636424548 QAA QAA QAA56555451353131 FEW NA 22  1 1 R DAQ
23  1 SPN4439434541424246474748505254545046393631 FEW NA 23  1 1 R DAQ
43  1 SPN4950454342393942444649515355575755524541 FEW NA 43  1 1 R DAQ
71  1 SPN5251484641404044475053585756565654504843 FEW NA 71  1 1 R DAQ
73  1 SPN4745434336323638424446505252515150434237 FEW NA 73  1 1 R DAQ
75  1 SPN5051474541384143454650565960595754494142 FEW NA 75  1 1 R DAQ
298  1 SPN5149464745444546494848515454545556515050 FEW NA 298  1 1 R DAQ
540  1 SPN4746434038363740444646485052535451433132 FEW NA 540  1 1 R DAQ
601  1 SPN5151474442414446474849515050515353535249 FEW NA 601  1 1 R DAQ
1019  1 SPN4543454342404345454444464954585856524544 FEW NA 1019  1 1 R DAQ
7772  1 SPN5049424038353639414243444444464746444446 FEW NA 7772  1 1 R DAQ
- These sites are maintained and operated by Clark County Department of Air Quality.

DAQ does not certify the validity or quality of data it hosts from other monitoring entities.
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 Clark County Department of Air Quality 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 Clark County Department of Air Quality 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.