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Return to main Clark County MeteoStar Monitoring web page

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 Wednesday, October 17, 2018.
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
Clark County - all times are in PST
43  1 191811159512253033373840414140383320 FEW NA 43  1 1 R DAQ
71  1 29272423101218323335383941424140393221 FEW NA 71  1 1 R DAQ
73  1 2525202317910252931313436363737342720 FEW NA 73  1 1 R DAQ
75  1 1219252727116123032363738393939383427 FEW NA 75  1 1 R DAQ
298  1 18161612513101629373838393939383324 FEW NA 298  1 1 R DAQ
540  1 111111241228373840414141393323 FEW NA 540  1 1 R DAQ
601  1 35333232323020303037383839393940393838 FEW NA 601  1 1 R DAQ
1019  1 32292725272827253537394042444443423734 FEW NA 1019  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.