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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, January 18, 2018.
measured in parts per billion
Mid 1:00 2:00 3:00 4:00 5:00
Clark County - all times are in PST
43  1 34 FEW NA NA NA 43  1 1 R DAQ
71  1 1411 FEW NA NA NA 71  1 1 R DAQ
73  1 1719 FEW NA NA NA 73  1 1 R DAQ
75  1 2012 FEW NA NA NA 75  1 1 R DAQ
298  1 14 FEW NA NA NA 298  1 1 R DAQ
540  1 00 FEW NA NA NA 540  1 1 R DAQ
601  1 2224 FEW NA NA NA 601  1 1 R DAQ
1019  1 1716 FEW NA NA NA 1019  1 1 R DAQ
8000  2 22 FEW LOST NA NA NA 8000  2 4 N Other
- These sites are maintained and operated by Clark County Department of Air Quality.
- These sites are maintained and operated by Paiute.

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.
 N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used 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.