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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 Friday, April 23, 2021.
measured in parts per billion
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
Clark County - all times are in PST
24  1 3429302622222333 FEW 24  1 1 R DAQ
43  1 4747423232212437 FEW 43  1 1 R DAQ
71  1 4540393634253944 FEW 71  1 1 R DAQ
73  1 4646414143313743 FEW 73  1 1 R DAQ
75  1 4344444240384146 FEW 75  1 1 R DAQ
298  1 4747454343454346 FEW 298  1 1 R DAQ
540  1 3837353026313136 FEW 540  1 1 R DAQ
602  1 4845434345434446 FEW 602  1 1 R DAQ
1019  1 4644444444434447 FEW 1019  1 1 R DAQ
7772  1 4344414242434346 FEW 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.