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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 Monday, February 18, 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
Clark County - all times are in PST
43  1 383542272620162035424444444443 FEW 43  1 1 R DAQ
71  1 383837292938383739394041414039 FEW 71  1 1 R DAQ
73  1 343234343135414241414141403939 FEW 73  1 1 R DAQ
75  1 393738373636363638393940393939 FEW 75  1 1 R DAQ
298  1 363635352422121736404041424240 FEW 298  1 1 R DAQ
540  1 342829252028303437404041414140 FEW 540  1 1 R DAQ
601  1 414241444240373636384142444443 FEW 601  1 1 R DAQ
1019  1 313031312936353433373841424344 FEW 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.