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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 Saturday, May 25, 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
Clark County - all times are in PST
22  1 3026262523232732364046484850 FEW 22  1 1 R DAQ
23  1 15141411891522303641444446 FEW 23  1 1 R DAQ
43  1 2215152223202729404751535252 FEW 43  1 1 R DAQ
71  1 3133312622232728354550525251 FEW 71  1 1 R DAQ
73  1 2725262322232727324047484848 FEW 73  1 1 R DAQ
75  1 4136202019192333383838383838 FEW 75  1 1 R DAQ
298  1 3025242217182033414851515354 FEW 298  1 1 R DAQ
540  1 7416151525384649494950 FEW 540  1 1 R DAQ
601  1 3940404141394042424949515354 FEW 601  1 1 R DAQ
1019  1 2525232125313238445153545354 FEW 1019  1 1 R DAQ
7772  1 PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM 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.